diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a7c821..636a764 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,30 +1,31 @@
 - [\[Unreleased\]](#unreleased)
+  - [Changed](#changed)
 - [\[0.11.0\] - 2024-01-02](#0110---2024-01-02)
   - [Added](#added)
-  - [Changed](#changed)
+  - [Changed](#changed-1)
 - [\[0.10.0\] - 2023-12-31](#0100---2023-12-31)
   - [Added](#added-1)
 - [\[0.9.1\] - 2023-12-12](#091---2023-12-12)
-  - [Changed](#changed-1)
+  - [Changed](#changed-2)
   - [Fixed](#fixed)
 - [\[0.9.0\] - 2023-12-12](#090---2023-12-12)
   - [Added](#added-2)
-  - [Changed](#changed-2)
+  - [Changed](#changed-3)
 - [\[0.8.0\] - 2023-12-11](#080---2023-12-11)
   - [Added](#added-3)
-  - [Changed](#changed-3)
+  - [Changed](#changed-4)
   - [Removed](#removed)
 - [\[0.7.0\] - 2023-10-27](#070---2023-10-27)
   - [Added](#added-4)
-  - [Changed](#changed-4)
+  - [Changed](#changed-5)
 - [\[0.6.0\] - 2023-10-11](#060---2023-10-11)
   - [Added](#added-5)
-  - [Changed](#changed-5)
+  - [Changed](#changed-6)
 - [\[0.5.0\] - 2023-10-09](#050---2023-10-09)
   - [Added](#added-6)
 - [\[0.4.0\] - 2023-09-28](#040---2023-09-28)
   - [Added](#added-7)
-  - [Changed](#changed-6)
+  - [Changed](#changed-7)
   - [Removed](#removed-1)
 - [\[0.3.0\] - 2023-09-26](#030---2023-09-26)
   - [Added](#added-8)
@@ -36,6 +37,14 @@
 
 ## [Unreleased]
 
+### Changed
+
+- **(BREAKING)** Renames the subject concept/term to `source`. When a mixin is included/extended, it defines the `Success()` and `Failure()` methods. Since the results are generated in a context (instance or singleton where the mixin was used), they will have a defined source (instance or singleton itself).
+  > Definition of source
+  >
+  > From dictionary:
+  > * a place, person, or thing from which something comes or can be obtained.
+
 ## [0.11.0] - 2024-01-02
 
 ### Added
@@ -45,6 +54,14 @@
 ### Changed
 
 - **(BREAKING)** Rename halted concept to terminal. Failures are terminal by default, but you can make a success terminal by enabling the `:continue` addon.
+  > Definition of terminal
+  >
+  > From dictionary:
+  > * of, forming, or situated at the end or extremity of something.
+  > * the end of a railroad or other transport route, or a station at such a point.
+  >
+  > From Wikipedia:
+  > * A "terminus" or "terminal" is a station at the end of a railway line.
 
 - **(BREAKING)** Rename `BCDD::Result::Context::Success#and_expose` halted keyword argument to `terminal`.
 
diff --git a/README.md b/README.md
index 167a01a..3e56ca5 100644
--- a/README.md
+++ b/README.md
@@ -649,9 +649,9 @@ Divide.call(2, 2)
 
 This method generates a module that any object can include or extend. It adds two methods to the target object: `Success()` and `Failure()`.
 
-The main difference between these methods and `BCDD::Result::Success()`/`BCDD::Result::Failure()` is that the former will utilize the target object (which has received the include/extend) as the result's subject.
+The main difference between these methods and `BCDD::Result::Success()`/`BCDD::Result::Failure()` is that the former will utilize the target object (which has received the include/extend) as the result's source.
 
-Because the result has a subject, the `#and_then` method can call methods from it.
+Because the result has a source, the `#and_then` method can call methods from it.
 
 ##### Class example (Instance Methods)
 
@@ -746,9 +746,9 @@ Divide.call(4, '2') #<BCDD::Result::Failure type=:invalid_arg value="arg2 must b
 
 To use the `#and_then` method to call methods, they must use `Success()` and `Failure()` to produce the results.
 
-If you try to use `BCDD::Result::Subject()`/`BCDD::Result::Failure()`, or results from another `BCDD::Result.mixin` instance with `#and_then`, it will raise an error because the subjects will be different.
+If you try to use `BCDD::Result::Success()`/`BCDD::Result::Failure()`, or results from another `BCDD::Result.mixin` instance with `#and_then`, it will raise an error because the sources are different.
 
-**Note:** You can still use the block syntax, but all the results must be produced by the subject's `Success()` and `Failure()` methods.
+**Note:** You can still use the block syntax, but all the results must be produced by the source's `Success()` and `Failure()` methods.
 
 ```ruby
 module ValidateNonzero
@@ -794,13 +794,13 @@ Look at the error produced by the code above:
 ```ruby
 Divide.call(2, 0)
 
-# You cannot call #and_then and return a result that does not belong to the subject! (BCDD::Result::Error::InvalidResultSubject)
-# Expected subject: Divide
-# Given subject: ValidateNonzero
+# You cannot call #and_then and return a result that does not belong to the same source! (BCDD::Result::Error::InvalidResultSource)
+# Expected source: Divide
+# Given source: ValidateNonzero
 # Given result: #<BCDD::Result::Failure type=:division_by_zero value="arg2 must not be zero">
 ```
 
-In order to fix this, you must handle the result produced by `ValidateNonzero.call()` and return a result that belongs to the subject.
+In order to fix this, you must handle the result produced by `ValidateNonzero.call()` and return a result that belongs to the same source.
 
 ```ruby
 module ValidateNonzero
@@ -832,7 +832,8 @@ module Divide
   end
 
   def validate_nonzero(numbers)
-    # In this case we are handling the other subject result and returning our own
+    # In this case we are handling the result from other source
+    # and returning our own
     ValidateNonzero.call(numbers).handle do |on|
       on.success { |numbers| Success(:ok, numbers) }
 
@@ -858,8 +859,8 @@ Divide.call(2, 0)
 
 ##### Dependency Injection
 
-The `BCDD::Result#and_then` accepts a second argument that will be used to share a value with the subject's method.
-To receive this argument, the subject's method must have an arity of two, where the first argument will be the result value and the second will be the shared value.
+The `BCDD::Result#and_then` accepts a second argument that will be used to share a value with the source's method.
+To receive this argument, the source's method must have an arity of two, where the first argument will be the result value and the second will be the injected value.
 
 ```ruby
 require 'logger'
@@ -1863,7 +1864,7 @@ result.transitions
       :parent=>{:id=>0, :name=>"SumDivisionsByTwo", :desc=>nil},
       :current=>{:id=>1, :name=>"Division", :desc=>"divide two numbers"},
       :result=>{:kind=>:success, :type=>:continued, :value=>[20, 2]},
-      :and_then=>{:type=>:method, :arg=>nil, :subject=><Division:0x0000000106099028>, :method_name=>:require_numbers},
+      :and_then=>{:type=>:method, :arg=>nil, :source=><Division:0x0000000106099028>, :method_name=>:require_numbers},
       :time=>2024-01-02 03:35:11.248558 UTC
     },
     {
@@ -1871,7 +1872,7 @@ result.transitions
       :parent=>{:id=>0, :name=>"SumDivisionsByTwo", :desc=>nil},
       :current=>{:id=>1, :name=>"Division", :desc=>"divide two numbers"},
       :result=>{:kind=>:success, :type=>:continued, :value=>[20, 2]},
-      :and_then=>{:type=>:method, :arg=>nil, :subject=><Division:0x0000000106099028>, :method_name=>:check_for_zeros},
+      :and_then=>{:type=>:method, :arg=>nil, :source=><Division:0x0000000106099028>, :method_name=>:check_for_zeros},
       :time=>2024-01-02 03:35:11.248587 UTC
     },
     {
@@ -1879,7 +1880,7 @@ result.transitions
       :parent=>{:id=>0, :name=>"SumDivisionsByTwo", :desc=>nil},
       :current=>{:id=>1, :name=>"Division", :desc=>"divide two numbers"},
       :result=>{:kind=>:success, :type=>:division_completed, :value=>10},
-      :and_then=>{:type=>:method, :arg=>nil, :subject=><Division:0x0000000106099028>, :method_name=>:divide},
+      :and_then=>{:type=>:method, :arg=>nil, :source=><Division:0x0000000106099028>, :method_name=>:divide},
       :time=>2024-01-02 03:35:11.248607 UTC
     },
     {
@@ -1895,7 +1896,7 @@ result.transitions
       :parent=>{:id=>0, :name=>"SumDivisionsByTwo", :desc=>nil},
       :current=>{:id=>2, :name=>"Division", :desc=>"divide two numbers"},
       :result=>{:kind=>:success, :type=>:continued, :value=>[10, 2]},
-      :and_then=>{:type=>:method, :arg=>nil, :subject=><Division:0x0000000106097ed0>, :method_name=>:require_numbers},
+      :and_then=>{:type=>:method, :arg=>nil, :source=><Division:0x0000000106097ed0>, :method_name=>:require_numbers},
       :time=>2024-01-02 03:35:11.248661 UTC
     },
     {
@@ -1903,7 +1904,7 @@ result.transitions
       :parent=>{:id=>0, :name=>"SumDivisionsByTwo", :desc=>nil},
       :current=>{:id=>2, :name=>"Division", :desc=>"divide two numbers"},
       :result=>{:kind=>:success, :type=>:continued, :value=>[10, 2]},
-      :and_then=>{:type=>:method, :arg=>nil, :subject=><Division:0x0000000106097ed0>, :method_name=>:check_for_zeros},
+      :and_then=>{:type=>:method, :arg=>nil, :source=><Division:0x0000000106097ed0>, :method_name=>:check_for_zeros},
       :time=>2024-01-02 03:35:11.248672 UTC
     },
     {
@@ -1911,7 +1912,7 @@ result.transitions
       :parent=>{:id=>0, :name=>"SumDivisionsByTwo", :desc=>nil},
       :current=>{:id=>2, :name=>"Division", :desc=>"divide two numbers"},
       :result=>{:kind=>:success, :type=>:division_completed, :value=>5},
-      :and_then=>{:type=>:method, :arg=>nil, :subject=><Division:0x0000000106097ed0>, :method_name=>:divide},
+      :and_then=>{:type=>:method, :arg=>nil, :source=><Division:0x0000000106097ed0>, :method_name=>:divide},
       :time=>2024-01-02 03:35:11.248682 UTC
     },
     {
diff --git a/lib/bcdd/result.rb b/lib/bcdd/result.rb
index 41661b5..42607bf 100644
--- a/lib/bcdd/result.rb
+++ b/lib/bcdd/result.rb
@@ -16,9 +16,9 @@
 class BCDD::Result
   attr_accessor :unknown, :transitions
 
-  attr_reader :subject, :data, :type_checker, :terminal
+  attr_reader :source, :data, :type_checker, :terminal
 
-  protected :subject
+  protected :source
 
   private :unknown, :unknown=, :type_checker, :transitions=
 
@@ -32,11 +32,11 @@ def self.configuration
     config.freeze
   end
 
-  def initialize(type:, value:, subject: nil, expectations: nil, terminal: nil)
+  def initialize(type:, value:, source: nil, expectations: nil, terminal: nil)
     data = Data.new(kind, type, value)
 
     @type_checker = Contract.evaluate(data, expectations)
-    @subject = subject
+    @source = source
     @terminal = terminal || kind == :failure
     @data = data
 
@@ -93,7 +93,7 @@ def and_then(method_name = nil, context = nil, &block)
 
     method_name && block and raise ::ArgumentError, 'method_name and block are mutually exclusive'
 
-    method_name ? call_and_then_subject_method(method_name, context) : call_and_then_block(block)
+    method_name ? call_and_then_source_method(method_name, context) : call_and_then_block(block)
   end
 
   def handle
@@ -139,27 +139,27 @@ def known(block)
     block.call(value, type)
   end
 
-  def call_and_then_subject_method(method_name, context_data)
-    method = subject.method(method_name)
+  def call_and_then_source_method(method_name, injected_value)
+    method = source.method(method_name)
 
-    Transitions.tracking.record_and_then(method, context_data, subject) do
-      result = call_and_then_subject_method!(method, context_data)
+    Transitions.tracking.record_and_then(method, injected_value, source) do
+      result = call_and_then_source_method!(method, injected_value)
 
       ensure_result_object(result, origin: :method)
     end
   end
 
-  def call_and_then_subject_method!(method, context_data)
+  def call_and_then_source_method!(method, injected_value)
     case method.arity
-    when 0 then subject.send(method.name)
-    when 1 then subject.send(method.name, value)
-    when 2 then subject.send(method.name, value, context_data)
-    else raise Error::InvalidSubjectMethodArity.build(subject: subject, method: method, max_arity: 2)
+    when 0 then source.send(method.name)
+    when 1 then source.send(method.name, value)
+    when 2 then source.send(method.name, value, injected_value)
+    else raise Error::InvalidSourceMethodArity.build(source: source, method: method, max_arity: 2)
     end
   end
 
   def call_and_then_block(block)
-    Transitions.tracking.record_and_then(:block, nil, subject) do
+    Transitions.tracking.record_and_then(:block, nil, source) do
       result = call_and_then_block!(block)
 
       ensure_result_object(result, origin: :block)
@@ -173,8 +173,8 @@ def call_and_then_block!(block)
   def ensure_result_object(result, origin:)
     raise Error::UnexpectedOutcome.build(outcome: result, origin: origin) unless result.is_a?(::BCDD::Result)
 
-    return result if result.subject.equal?(subject)
+    return result if result.source.equal?(source)
 
-    raise Error::InvalidResultSubject.build(given_result: result, expected_subject: subject)
+    raise Error::InvalidResultSource.build(given_result: result, expected_source: source)
   end
 end
diff --git a/lib/bcdd/result/context.rb b/lib/bcdd/result/context.rb
index 4ebd63c..a070f15 100644
--- a/lib/bcdd/result/context.rb
+++ b/lib/bcdd/result/context.rb
@@ -15,7 +15,7 @@ def self.Failure(type, **value)
       Failure.new(type: type, value: value)
     end
 
-    def initialize(type:, value:, subject: nil, expectations: nil, terminal: nil)
+    def initialize(type:, value:, source: nil, expectations: nil, terminal: nil)
       value.is_a?(::Hash) or raise ::ArgumentError, 'value must be a Hash'
 
       @acc = {}
@@ -23,8 +23,8 @@ def initialize(type:, value:, subject: nil, expectations: nil, terminal: nil)
       super
     end
 
-    def and_then(method_name = nil, **context_data, &block)
-      super(method_name, context_data, &block)
+    def and_then(method_name = nil, **injected_value, &block)
+      super(method_name, injected_value, &block)
     end
 
     protected
@@ -33,20 +33,20 @@ def and_then(method_name = nil, **context_data, &block)
 
     private
 
-    SubjectMethodArity = ->(method) do
+    SourceMethodArity = ->(method) do
       return 0 if method.arity.zero?
       return 1 if method.parameters.map(&:first).all?(/\Akey/)
 
       -1
     end
 
-    def call_and_then_subject_method!(method, context_data)
-      acc.merge!(value.merge(context_data))
+    def call_and_then_source_method!(method, injected_value)
+      acc.merge!(value.merge(injected_value))
 
-      case SubjectMethodArity[method]
-      when 0 then subject.send(method.name)
-      when 1 then subject.send(method.name, **acc)
-      else raise Error::InvalidSubjectMethodArity.build(subject: subject, method: method, max_arity: 1)
+      case SourceMethodArity[method]
+      when 0 then source.send(method.name)
+      when 1 then source.send(method.name, **acc)
+      else raise Error::InvalidSourceMethodArity.build(source: source, method: method, max_arity: 1)
       end
     end
 
@@ -59,9 +59,9 @@ def call_and_then_block!(block)
     def ensure_result_object(result, origin:)
       raise_unexpected_outcome_error(result, origin) unless result.is_a?(Context)
 
-      return result.tap { _1.acc.merge!(acc) } if result.subject.equal?(subject)
+      return result.tap { _1.acc.merge!(acc) } if result.source.equal?(source)
 
-      raise Error::InvalidResultSubject.build(given_result: result, expected_subject: subject)
+      raise Error::InvalidResultSource.build(given_result: result, expected_source: source)
     end
 
     EXPECTED_OUTCOME = 'BCDD::Result::Context::Success or BCDD::Result::Context::Failure'
@@ -70,6 +70,6 @@ def raise_unexpected_outcome_error(result, origin)
       raise Error::UnexpectedOutcome.build(outcome: result, origin: origin, expected: EXPECTED_OUTCOME)
     end
 
-    private_constant :SubjectMethodArity, :EXPECTED_OUTCOME
+    private_constant :SourceMethodArity, :EXPECTED_OUTCOME
   end
 end
diff --git a/lib/bcdd/result/context/expectations/mixin.rb b/lib/bcdd/result/context/expectations/mixin.rb
index 1545f43..38c2942 100644
--- a/lib/bcdd/result/context/expectations/mixin.rb
+++ b/lib/bcdd/result/context/expectations/mixin.rb
@@ -9,7 +9,7 @@ module Expectations::Mixin
     module Addons
       module Continue
         private def Continue(**value)
-          Success.new(type: :continued, value: value, subject: self)
+          Success.new(type: :continued, value: value, source: self)
         end
       end
 
@@ -17,7 +17,7 @@ module Given
         private def Given(*values)
           value = values.map(&:to_h).reduce({}) { |acc, val| acc.merge(val) }
 
-          Success.new(type: :given, value: value, subject: self)
+          Success.new(type: :given, value: value, source: self)
         end
       end
 
diff --git a/lib/bcdd/result/context/mixin.rb b/lib/bcdd/result/context/mixin.rb
index 2a5337f..3c30e36 100644
--- a/lib/bcdd/result/context/mixin.rb
+++ b/lib/bcdd/result/context/mixin.rb
@@ -14,7 +14,7 @@ def Failure(type, **value)
       end
 
       private def _ResultAs(kind_class, type, value, terminal: nil)
-        kind_class.new(type: type, value: value, subject: self, terminal: terminal)
+        kind_class.new(type: type, value: value, source: self, terminal: terminal)
       end
     end
 
diff --git a/lib/bcdd/result/context/success.rb b/lib/bcdd/result/context/success.rb
index 908314f..7c1baae 100644
--- a/lib/bcdd/result/context/success.rb
+++ b/lib/bcdd/result/context/success.rb
@@ -10,6 +10,6 @@ def and_expose(type, keys, terminal: true)
 
     exposed_value = acc.merge(value).slice(*keys)
 
-    self.class.new(type: type, value: exposed_value, subject: subject, terminal: terminal)
+    self.class.new(type: type, value: exposed_value, source: source, terminal: terminal)
   end
 end
diff --git a/lib/bcdd/result/error.rb b/lib/bcdd/result/error.rb
index a89c1cb..61fc448 100644
--- a/lib/bcdd/result/error.rb
+++ b/lib/bcdd/result/error.rb
@@ -22,29 +22,29 @@ def self.build(outcome:, origin:, expected: nil)
     end
   end
 
-  class InvalidResultSubject < self
-    def self.build(given_result:, expected_subject:)
+  class InvalidResultSource < self
+    def self.build(given_result:, expected_source:)
       message =
-        "You cannot call #and_then and return a result that does not belong to the subject!\n" \
-        "Expected subject: #{expected_subject.inspect}\n" \
-        "Given subject: #{given_result.send(:subject).inspect}\n" \
+        "You cannot call #and_then and return a result that does not belong to the same source!\n" \
+        "Expected source: #{expected_source.inspect}\n" \
+        "Given source: #{given_result.send(:source).inspect}\n" \
         "Given result: #{given_result.inspect}"
 
       new(message)
     end
   end
 
-  class InvalidSubjectMethodArity < self
-    def self.build(subject:, method:, max_arity:)
-      new("#{subject.class}##{method.name} has unsupported arity (#{method.arity}). Expected 0..#{max_arity}")
+  class InvalidSourceMethodArity < self
+    def self.build(source:, method:, max_arity:)
+      new("#{source.class}##{method.name} has unsupported arity (#{method.arity}). Expected 0..#{max_arity}")
     end
   end
 
   class UnhandledTypes < self
     def self.build(types:)
-      subject = types.size == 1 ? 'This was' : 'These were'
+      source = types.size == 1 ? 'This was' : 'These were'
 
-      new("You must handle all cases. #{subject} not handled: #{types.map(&:inspect).join(', ')}")
+      new("You must handle all cases. #{source} not handled: #{types.map(&:inspect).join(', ')}")
     end
   end
 end
diff --git a/lib/bcdd/result/expectations.rb b/lib/bcdd/result/expectations.rb
index a803739..3135659 100644
--- a/lib/bcdd/result/expectations.rb
+++ b/lib/bcdd/result/expectations.rb
@@ -38,10 +38,10 @@ def self.new(...)
 
     private_class_method :mixin!, :mixin_module, :result_factory_without_expectations
 
-    def initialize(subject: nil, contract: nil, terminal: nil, **options)
+    def initialize(source: nil, contract: nil, terminal: nil, **options)
       @terminal = terminal
 
-      @subject = subject
+      @source = source
 
       @contract = contract if contract.is_a?(Contract::Evaluator)
 
@@ -60,16 +60,16 @@ def Failure(type, value = nil)
       _ResultAs(Failure, type, value)
     end
 
-    def with(subject:, terminal: nil)
-      self.class.new(subject: subject, terminal: terminal, contract: contract)
+    def with(source:, terminal: nil)
+      self.class.new(source: source, terminal: terminal, contract: contract)
     end
 
     private
 
     def _ResultAs(kind_class, type, value)
-      kind_class.new(type: type, value: value, subject: subject, expectations: contract, terminal: terminal)
+      kind_class.new(type: type, value: value, source: source, expectations: contract, terminal: terminal)
     end
 
-    attr_reader :subject, :terminal, :contract
+    attr_reader :source, :terminal, :contract
   end
 end
diff --git a/lib/bcdd/result/expectations/mixin.rb b/lib/bcdd/result/expectations/mixin.rb
index c469079..8915536 100644
--- a/lib/bcdd/result/expectations/mixin.rb
+++ b/lib/bcdd/result/expectations/mixin.rb
@@ -24,7 +24,7 @@ def Failure(...)
 
       FACTORY = <<~RUBY
         private def _Result
-          @_Result ||= Result.with(subject: self, terminal: %<terminal>s)
+          @_Result ||= Result.with(source: self, terminal: %<terminal>s)
         end
       RUBY
 
@@ -38,13 +38,13 @@ def self.to_eval(addons)
     module Addons
       module Continue
         private def Continue(value)
-          Success.new(type: :continued, value: value, subject: self)
+          Success.new(type: :continued, value: value, source: self)
         end
       end
 
       module Given
         private def Given(value)
-          Success.new(type: :given, value: value, subject: self)
+          Success.new(type: :given, value: value, source: self)
         end
       end
 
diff --git a/lib/bcdd/result/mixin.rb b/lib/bcdd/result/mixin.rb
index 7a60650..1a0cd27 100644
--- a/lib/bcdd/result/mixin.rb
+++ b/lib/bcdd/result/mixin.rb
@@ -21,7 +21,7 @@ def Failure(type, value = nil)
       end
 
       private def _ResultAs(kind_class, type, value, terminal: nil)
-        kind_class.new(type: type, value: value, subject: self, terminal: terminal)
+        kind_class.new(type: type, value: value, source: self, terminal: terminal)
       end
     end
 
diff --git a/lib/bcdd/result/transitions/tracking/disabled.rb b/lib/bcdd/result/transitions/tracking/disabled.rb
index 7fa8b7a..7acf7ed 100644
--- a/lib/bcdd/result/transitions/tracking/disabled.rb
+++ b/lib/bcdd/result/transitions/tracking/disabled.rb
@@ -10,7 +10,7 @@ def self.reset!; end
 
     def self.record(result); end
 
-    def self.record_and_then(_type, _data, _subject)
+    def self.record_and_then(_type, _data, _source)
       yield
     end
   end
diff --git a/lib/bcdd/result/transitions/tracking/enabled.rb b/lib/bcdd/result/transitions/tracking/enabled.rb
index b5b1ad2..4f43235 100644
--- a/lib/bcdd/result/transitions/tracking/enabled.rb
+++ b/lib/bcdd/result/transitions/tracking/enabled.rb
@@ -38,11 +38,11 @@ def record(result)
       track(result, time: ::Time.now.getutc)
     end
 
-    def record_and_then(type_arg, arg, subject)
+    def record_and_then(type_arg, arg, source)
       type = type_arg.instance_of?(::Method) ? :method : type_arg
 
       unless tree.frozen?
-        current_and_then = { type: type, arg: arg, subject: subject }
+        current_and_then = { type: type, arg: arg, source: source }
         current_and_then[:method_name] = type_arg.name if type == :method
 
         tree.current.value[1] = current_and_then
diff --git a/sig/bcdd/result.rbs b/sig/bcdd/result.rbs
index 011ff04..5612c84 100644
--- a/sig/bcdd/result.rbs
+++ b/sig/bcdd/result.rbs
@@ -4,7 +4,7 @@ class BCDD::Result
   private attr_reader type_checker: BCDD::Result::Contract::TypeChecker
 
   attr_reader data: BCDD::Result::Data
-  attr_reader subject: untyped
+  attr_reader source: untyped
   attr_reader terminal: bool
   attr_reader transitions: Hash[Symbol, untyped]
 
@@ -14,7 +14,7 @@ class BCDD::Result
   def initialize: (
     type: Symbol,
     value: untyped,
-    ?subject: untyped,
+    ?source: untyped,
     ?expectations: BCDD::Result::Contract::Evaluator,
     ?terminal: bool
   ) -> void
@@ -51,8 +51,8 @@ class BCDD::Result
 
   def kind: -> Symbol
   def known: (Proc) -> untyped
-  def call_and_then_subject_method: (Symbol, untyped) -> BCDD::Result
-  def call_and_then_subject_method!: (untyped, untyped) -> BCDD::Result
+  def call_and_then_source_method: (Symbol, untyped) -> BCDD::Result
+  def call_and_then_source_method!: (untyped, untyped) -> BCDD::Result
   def call_and_then_block: (untyped) -> BCDD::Result
   def call_and_then_block!: (untyped) -> BCDD::Result
   def ensure_result_object: (untyped, origin: Symbol) -> BCDD::Result
diff --git a/sig/bcdd/result/context.rbs b/sig/bcdd/result/context.rbs
index 0b360e9..ac98d71 100644
--- a/sig/bcdd/result/context.rbs
+++ b/sig/bcdd/result/context.rbs
@@ -1,14 +1,14 @@
 class BCDD::Result::Context < BCDD::Result
   EXPECTED_OUTCOME: String
 
-  SubjectMethodArity: ^(Method) -> Integer
+  SourceMethodArity: ^(Method) -> Integer
 
   attr_reader acc: Hash[Symbol, untyped]
 
   def initialize: (
     type: Symbol,
     value: untyped,
-    ?subject: untyped,
+    ?source: untyped,
     ?expectations: BCDD::Result::Contract::Evaluator,
     ?terminal: bool
   ) -> void
@@ -17,7 +17,7 @@ class BCDD::Result::Context < BCDD::Result
 
   private
 
-  def call_and_then_subject_method: (Symbol, Hash[Symbol, untyped]) -> BCDD::Result::Context
+  def call_and_then_source_method: (Symbol, Hash[Symbol, untyped]) -> BCDD::Result::Context
   def ensure_result_object: (untyped, origin: Symbol) -> BCDD::Result::Context
 
   def raise_unexpected_outcome_error: (BCDD::Result::Context | untyped, Symbol) -> void
diff --git a/sig/bcdd/result/error.rbs b/sig/bcdd/result/error.rbs
index b91836f..9711384 100644
--- a/sig/bcdd/result/error.rbs
+++ b/sig/bcdd/result/error.rbs
@@ -13,14 +13,14 @@ class BCDD::Result
           -> BCDD::Result::Error::UnexpectedOutcome
     end
 
-    class InvalidResultSubject < BCDD::Result::Error
-      def self.build: (given_result: BCDD::Result, expected_subject: untyped)
-          -> BCDD::Result::Error::InvalidResultSubject
+    class InvalidResultSource < BCDD::Result::Error
+      def self.build: (given_result: BCDD::Result, expected_source: untyped)
+          -> BCDD::Result::Error::InvalidResultSource
     end
 
-    class InvalidSubjectMethodArity < BCDD::Result::Error
-      def self.build: (subject: untyped, method: Method, max_arity: Integer)
-        -> BCDD::Result::Error::InvalidSubjectMethodArity
+    class InvalidSourceMethodArity < BCDD::Result::Error
+      def self.build: (source: untyped, method: Method, max_arity: Integer)
+        -> BCDD::Result::Error::InvalidSourceMethodArity
     end
 
     class UnhandledTypes < BCDD::Result::Error
diff --git a/sig/bcdd/result/expectations.rbs b/sig/bcdd/result/expectations.rbs
index cfee370..0c1b399 100644
--- a/sig/bcdd/result/expectations.rbs
+++ b/sig/bcdd/result/expectations.rbs
@@ -16,14 +16,14 @@ class BCDD::Result::Expectations
   def self.result_factory_without_expectations: -> singleton(BCDD::Result)
 
   def self.new: (
-    ?subject: untyped,
+    ?source: untyped,
     ?contract: BCDD::Result::Contract::Evaluator,
     ?terminal: bool,
     **untyped
   ) -> (BCDD::Result::Expectations | untyped)
 
   def initialize: (
-    ?subject: untyped,
+    ?source: untyped,
     ?contract: BCDD::Result::Contract::Evaluator,
     ?terminal: bool,
     **untyped
@@ -32,13 +32,13 @@ class BCDD::Result::Expectations
   def Success: (Symbol, ?untyped) -> BCDD::Result::Success
   def Failure: (Symbol, ?untyped) -> BCDD::Result::Failure
 
-  def with: (subject: untyped) -> BCDD::Result::Expectations
+  def with: (source: untyped) -> BCDD::Result::Expectations
 
   private
 
   def _ResultAs: (singleton(BCDD::Result), Symbol, untyped) -> untyped
 
-  attr_reader subject: untyped
+  attr_reader source: untyped
   attr_reader contract: BCDD::Result::Contract::Evaluator
   attr_reader terminal: bool
 end
diff --git a/test/bcdd/result/and_then/with_subject_test.rb b/test/bcdd/result/and_then/with_source_test.rb
similarity index 65%
rename from test/bcdd/result/and_then/with_subject_test.rb
rename to test/bcdd/result/and_then/with_source_test.rb
index 8810ee6..dc4b91e 100644
--- a/test/bcdd/result/and_then/with_subject_test.rb
+++ b/test/bcdd/result/and_then/with_source_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class AndThenWithSubjectTest < Minitest::Test
+  class AndThenWithSourceTest < Minitest::Test
     class Base
       include BCDD::Result.mixin
 
@@ -25,7 +25,7 @@ def validate_numbers
       end
     end
 
-    class SubjectMethodArityWithArityZero < Base
+    class SourceMethodArityWithArityZero < Base
       def call
         validate_numbers.and_then(:add)
       end
@@ -37,7 +37,7 @@ def add
       end
     end
 
-    class SubjectMethodArityWithArityOne < Base
+    class SourceMethodArityWithArityOne < Base
       def call
         validate_numbers
           .and_then { Success(:ok, [arg1, arg2]) }
@@ -49,7 +49,7 @@ def add((number1, number2))
       end
     end
 
-    class SubjectMethodArityWithArityTwo < Base
+    class SourceMethodArityWithArityTwo < Base
       def call
         context = { number: 3 }
 
@@ -63,7 +63,7 @@ def add((number1, number2), context)
       end
     end
 
-    class InvalidSubjectMethodArity < Base
+    class InvalidSourceMethodArity < Base
       def call
         validate_numbers.and_then(:add)
       end
@@ -73,9 +73,9 @@ def add(number1, number2, _number3)
       end
     end
 
-    class InvalidResultSubjectFromBlock < Base
+    class InvalidResultSourceFromBlock < Base
       def add_instance
-        @add_instance ||= SubjectMethodArityWithArityZero.new(arg1, arg2)
+        @add_instance ||= SourceMethodArityWithArityZero.new(arg1, arg2)
       end
 
       def call
@@ -83,9 +83,9 @@ def call
       end
     end
 
-    class InvalidResultSubjectFromMethod < Base
+    class InvalidResultSourceFromMethod < Base
       def add_instance
-        @add_instance ||= SubjectMethodArityWithArityZero.new(arg1, arg2)
+        @add_instance ||= SourceMethodArityWithArityZero.new(arg1, arg2)
       end
 
       def call
@@ -113,63 +113,63 @@ def add
       end
     end
 
-    test '#and_then calling a subject method (arity 0)' do
-      result = SubjectMethodArityWithArityZero.new(1, 2).call
+    test '#and_then calling a source method (arity 0)' do
+      result = SourceMethodArityWithArityZero.new(1, 2).call
 
       assert_predicate(result, :success?)
       assert_equal(:number, result.type)
       assert_equal(3, result.value)
     end
 
-    test '#and_then calling a subject method (arity 1)' do
-      result = SubjectMethodArityWithArityOne.new(1, 2).call
+    test '#and_then calling a source method (arity 1)' do
+      result = SourceMethodArityWithArityOne.new(1, 2).call
 
       assert_predicate(result, :success?)
       assert_equal(:number, result.type)
       assert_equal(3, result.value)
     end
 
-    test '#and_then calling a subject method (arity 2)' do
-      result = SubjectMethodArityWithArityTwo.new(1, 2).call
+    test '#and_then calling a source method (arity 2)' do
+      result = SourceMethodArityWithArityTwo.new(1, 2).call
 
       assert_predicate(result, :success?)
       assert_equal(:number, result.type)
       assert_equal(6, result.value)
     end
 
-    test '#and_then calling a subject method with wrong arity (> 2)' do
-      wrong_subject_method_arity = InvalidSubjectMethodArity.new(1, 2)
+    test '#and_then calling a source method with wrong arity (> 2)' do
+      wrong_source_method_arity = InvalidSourceMethodArity.new(1, 2)
 
-      error = assert_raises(BCDD::Result::Error::InvalidSubjectMethodArity) { wrong_subject_method_arity.call }
+      error = assert_raises(BCDD::Result::Error::InvalidSourceMethodArity) { wrong_source_method_arity.call }
 
-      expected_message = "#{InvalidSubjectMethodArity}#add has unsupported arity (3). Expected 0..2"
+      expected_message = "#{InvalidSourceMethodArity}#add has unsupported arity (3). Expected 0..2"
 
       assert_equal(expected_message, error.message)
     end
 
-    test '#and_then raises an error when the block returns a result that does not belongs to the subject' do
-      wrong_result_subject = InvalidResultSubjectFromBlock.new(1, 2)
+    test '#and_then raises an error when the block returns a result that does not belongs to the source' do
+      wrong_result_source = InvalidResultSourceFromBlock.new(1, 2)
 
-      error = assert_raises(BCDD::Result::Error::InvalidResultSubject) { wrong_result_subject.call }
+      error = assert_raises(BCDD::Result::Error::InvalidResultSource) { wrong_result_source.call }
 
       expected_message =
-        "You cannot call #and_then and return a result that does not belong to the subject!\n" \
-        "Expected subject: #{wrong_result_subject.inspect}\n" \
-        "Given subject: #{wrong_result_subject.add_instance.inspect}\n" \
+        "You cannot call #and_then and return a result that does not belong to the same source!\n" \
+        "Expected source: #{wrong_result_source.inspect}\n" \
+        "Given source: #{wrong_result_source.add_instance.inspect}\n" \
         'Given result: #<BCDD::Result::Success type=:number value=3>'
 
       assert_equal(expected_message, error.message)
     end
 
-    test '#and_then raises an error when the called method returns a result that does not belongs to the subject' do
-      wrong_result_subject = InvalidResultSubjectFromMethod.new(1, 2)
+    test '#and_then raises an error when the called method returns a result that does not belongs to the source' do
+      wrong_result_source = InvalidResultSourceFromMethod.new(1, 2)
 
-      error = assert_raises(BCDD::Result::Error::InvalidResultSubject) { wrong_result_subject.call }
+      error = assert_raises(BCDD::Result::Error::InvalidResultSource) { wrong_result_source.call }
 
       expected_message =
-        "You cannot call #and_then and return a result that does not belong to the subject!\n" \
-        "Expected subject: #{wrong_result_subject.inspect}\n" \
-        "Given subject: #{wrong_result_subject.add_instance.inspect}\n" \
+        "You cannot call #and_then and return a result that does not belong to the same source!\n" \
+        "Expected source: #{wrong_result_source.inspect}\n" \
+        "Given source: #{wrong_result_source.add_instance.inspect}\n" \
         'Given result: #<BCDD::Result::Success type=:number value=3>'
 
       assert_equal(expected_message, error.message)
diff --git a/test/bcdd/result/and_then/without_subject_test.rb b/test/bcdd/result/and_then/without_source_test.rb
similarity index 97%
rename from test/bcdd/result/and_then/without_subject_test.rb
rename to test/bcdd/result/and_then/without_source_test.rb
index 756fe22..f37a955 100644
--- a/test/bcdd/result/and_then/without_subject_test.rb
+++ b/test/bcdd/result/and_then/without_source_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class AndThenWithoutSubjectTest < Minitest::Test
+  class AndThenWithoutSourceTest < Minitest::Test
     test '#and_then does not execute the block if the result is a failure' do
       result =
         Success
diff --git a/test/bcdd/result/context/and_then/with_subject_test.rb b/test/bcdd/result/context/and_then/with_source_test.rb
similarity index 65%
rename from test/bcdd/result/context/and_then/with_subject_test.rb
rename to test/bcdd/result/context/and_then/with_source_test.rb
index e67f0e0..f00152d 100644
--- a/test/bcdd/result/context/and_then/with_subject_test.rb
+++ b/test/bcdd/result/context/and_then/with_source_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class ContextAndThenWithSubjectTest < Minitest::Test
+  class ContextAndThenWithSourceTest < Minitest::Test
     class Base
       include BCDD::Result::Context.mixin
 
@@ -25,7 +25,7 @@ def validate_numbers
       end
     end
 
-    class SubjectMethodArityWithArityZero < Base
+    class SourceMethodArityWithArityZero < Base
       def call
         validate_numbers.and_then(:add)
       end
@@ -37,7 +37,7 @@ def add
       end
     end
 
-    class SubjectMethodArityWithArityOneKarg < Base
+    class SourceMethodArityWithArityOneKarg < Base
       def call
         validate_numbers
           .and_then { Success(:ok, number1: arg1, number2: arg2) }
@@ -49,7 +49,7 @@ def add(number1:, number2:)
       end
     end
 
-    class SubjectMethodArityWithArityOneArg < Base
+    class SourceMethodArityWithArityOneArg < Base
       def call
         validate_numbers
           .and_then { Success(:ok, number1: arg1, number2: arg2) }
@@ -61,7 +61,7 @@ def add(args)
       end
     end
 
-    class SubjectMethodArityWithContextData < Base
+    class SourceMethodArityWithContextData < Base
       def call
         validate_numbers
           .and_then { Success(:ok, number1: arg1, number2: arg2) }
@@ -73,7 +73,7 @@ def add(number1:, number2:, number3:)
       end
     end
 
-    class InvalidSubjectMethodArity < Base
+    class InvalidSourceMethodArity < Base
       def call
         validate_numbers.and_then(:add)
       end
@@ -83,9 +83,9 @@ def add(number1, number2)
       end
     end
 
-    class InvalidResultSubjectFromBlock < Base
+    class InvalidResultSourceFromBlock < Base
       def add_instance
-        @add_instance ||= SubjectMethodArityWithArityZero.new(arg1, arg2)
+        @add_instance ||= SourceMethodArityWithArityZero.new(arg1, arg2)
       end
 
       def call
@@ -93,9 +93,9 @@ def call
       end
     end
 
-    class InvalidResultSubjectFromMethod < Base
+    class InvalidResultSourceFromMethod < Base
       def add_instance
-        @add_instance ||= SubjectMethodArityWithArityZero.new(arg1, arg2)
+        @add_instance ||= SourceMethodArityWithArityZero.new(arg1, arg2)
       end
 
       def call
@@ -123,69 +123,69 @@ def add
       end
     end
 
-    test '#and_then calling a subject method (arity 0)' do
-      result = SubjectMethodArityWithArityZero.new(1, 2).call
+    test '#and_then calling a source method (arity 0)' do
+      result = SourceMethodArityWithArityZero.new(1, 2).call
 
       assert_predicate(result, :success?)
       assert_equal(:ok, result.type)
       assert_equal({ number: 3 }, result.value)
     end
 
-    test '#and_then calling a subject method (arity 1 - keyword args)' do
-      result = SubjectMethodArityWithArityOneKarg.new(1, 2).call
+    test '#and_then calling a source method (arity 1 - keyword args)' do
+      result = SourceMethodArityWithArityOneKarg.new(1, 2).call
 
       assert_predicate(result, :success?)
       assert_equal(:ok, result.type)
       assert_equal({ number: 3 }, result.value)
     end
 
-    test '#and_then calling a subject method with context data' do
-      result = SubjectMethodArityWithContextData.new(1, 2).call
+    test '#and_then calling a source method with context data' do
+      result = SourceMethodArityWithContextData.new(1, 2).call
 
       assert_predicate(result, :success?)
       assert_equal(:ok, result.type)
       assert_equal({ number: 6 }, result.value)
     end
 
-    test '#and_then calling a subject method (arity 1 - positional arg)' do
-      invalid_subject_method = SubjectMethodArityWithArityOneArg.new(1, 2)
+    test '#and_then calling a source method (arity 1 - positional arg)' do
+      invalid_source_method = SourceMethodArityWithArityOneArg.new(1, 2)
 
-      error = assert_raises(BCDD::Result::Error::InvalidSubjectMethodArity) { invalid_subject_method.call }
+      error = assert_raises(BCDD::Result::Error::InvalidSourceMethodArity) { invalid_source_method.call }
 
       assert_match(/#add has unsupported arity \(1\). Expected 0..1\z/, error.message)
     end
 
-    test '#and_then calling a subject method with wrong arity (> 1)' do
-      wrong_subject_method_arity = InvalidSubjectMethodArity.new(1, 2)
+    test '#and_then calling a source method with wrong arity (> 1)' do
+      wrong_source_method_arity = InvalidSourceMethodArity.new(1, 2)
 
-      error = assert_raises(BCDD::Result::Error::InvalidSubjectMethodArity) { wrong_subject_method_arity.call }
+      error = assert_raises(BCDD::Result::Error::InvalidSourceMethodArity) { wrong_source_method_arity.call }
 
       assert_match(/#add has unsupported arity \(2\). Expected 0..1\z/, error.message)
     end
 
-    test '#and_then raises an error when the block returns a result that does not belongs to the subject' do
-      wrong_result_subject = InvalidResultSubjectFromBlock.new(1, 2)
+    test '#and_then raises an error when the block returns a result that does not belongs to the source' do
+      wrong_result_source = InvalidResultSourceFromBlock.new(1, 2)
 
-      error = assert_raises(BCDD::Result::Error::InvalidResultSubject) { wrong_result_subject.call }
+      error = assert_raises(BCDD::Result::Error::InvalidResultSource) { wrong_result_source.call }
 
       expected_message =
-        "You cannot call #and_then and return a result that does not belong to the subject!\n" \
-        "Expected subject: #{wrong_result_subject.inspect}\n" \
-        "Given subject: #{wrong_result_subject.add_instance.inspect}\n" \
+        "You cannot call #and_then and return a result that does not belong to the same source!\n" \
+        "Expected source: #{wrong_result_source.inspect}\n" \
+        "Given source: #{wrong_result_source.add_instance.inspect}\n" \
         'Given result: #<BCDD::Result::Context::Success type=:ok value={:number=>3}>'
 
       assert_equal(expected_message, error.message)
     end
 
-    test '#and_then raises an error when the called method returns a result that does not belongs to the subject' do
-      wrong_result_subject = InvalidResultSubjectFromMethod.new(1, 2)
+    test '#and_then raises an error when the called method returns a result that does not belongs to the source' do
+      wrong_result_source = InvalidResultSourceFromMethod.new(1, 2)
 
-      error = assert_raises(BCDD::Result::Error::InvalidResultSubject) { wrong_result_subject.call }
+      error = assert_raises(BCDD::Result::Error::InvalidResultSource) { wrong_result_source.call }
 
       expected_message =
-        "You cannot call #and_then and return a result that does not belong to the subject!\n" \
-        "Expected subject: #{wrong_result_subject.inspect}\n" \
-        "Given subject: #{wrong_result_subject.add_instance.inspect}\n" \
+        "You cannot call #and_then and return a result that does not belong to the same source!\n" \
+        "Expected source: #{wrong_result_source.inspect}\n" \
+        "Given source: #{wrong_result_source.add_instance.inspect}\n" \
         'Given result: #<BCDD::Result::Context::Success type=:ok value={:number=>3}>'
 
       assert_equal(expected_message, error.message)
diff --git a/test/bcdd/result/context/and_then/without_subject_test.rb b/test/bcdd/result/context/and_then/without_source_test.rb
similarity index 97%
rename from test/bcdd/result/context/and_then/without_subject_test.rb
rename to test/bcdd/result/context/and_then/without_source_test.rb
index 0e562b7..af8b8ad 100644
--- a/test/bcdd/result/context/and_then/without_subject_test.rb
+++ b/test/bcdd/result/context/and_then/without_source_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class ContextAndThenWithoutSubjectTest < Minitest::Test
+  class ContextAndThenWithoutSourceTest < Minitest::Test
     test '#and_then does not execute the block if the result is a failure' do
       result =
         Context::Success
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/type/invalid_type_test.rb b/test/bcdd/result/context/expectations/with_source/failure/type/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/context/expectations/with_subject/failure/type/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/type/invalid_type_test.rb
index 55b73c6..ca55539 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/type/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureInvalidTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureInvalidTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: :err
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value/invalid_type_test.rb b/test/bcdd/result/context/expectations/with_source/failure/type_and_value/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/context/expectations/with_subject/failure/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/type_and_value/invalid_type_test.rb
index 42936a3..3e558a4 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureInvalidTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureInvalidTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value/invalid_value_test.rb b/test/bcdd/result/context/expectations/with_source/failure/type_and_value/invalid_value_test.rb
similarity index 90%
rename from test/bcdd/result/context/expectations/with_subject/failure/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/type_and_value/invalid_value_test.rb
index de8560e..1cd476b 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/context/expectations/with_source/failure/type_and_value/pattern_matching_error_test.rb
similarity index 91%
rename from test/bcdd/result/context/expectations/with_subject/failure/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/type_and_value/pattern_matching_error_test.rb
index c6a0c78..81b1d1c 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value_test.rb b/test/bcdd/result/context/expectations/with_source/failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/failure/type_and_value_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/type_and_value_test.rb
index f4d5eb4..ba5b03b 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/type_test.rb b/test/bcdd/result/context/expectations/with_source/failure/type_test.rb
similarity index 97%
rename from test/bcdd/result/context/expectations/with_subject/failure/type_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/type_test.rb
index bc67ee2..f5d1f16 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: :err
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/types/invalid_type_test.rb b/test/bcdd/result/context/expectations/with_source/failure/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/context/expectations/with_subject/failure/types/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/types/invalid_type_test.rb
index 7faf122..71a439b 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/types/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureInvalidTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureInvalidTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: %i[err1 err2]
diff --git a/test/bcdd/result/context/expectations/with_subject/failure/types_test.rb b/test/bcdd/result/context/expectations/with_source/failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/failure/types_test.rb
rename to test/bcdd/result/context/expectations/with_source/failure/types_test.rb
index cf46e88..0d6697d 100644
--- a/test/bcdd/result/context/expectations/with_subject/failure/types_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectFailureTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceFailureTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       failure: %i[invalid_arg division_by_zero]
diff --git a/test/bcdd/result/context/expectations/with_subject/success/type/invalid_type_test.rb b/test/bcdd/result/context/expectations/with_source/success/type/invalid_type_test.rb
similarity index 89%
rename from test/bcdd/result/context/expectations/with_subject/success/type/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/type/invalid_type_test.rb
index 611c19d..2039bad 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/type/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessInvalidTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessInvalidTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: :ok
diff --git a/test/bcdd/result/context/expectations/with_subject/success/type_and_value/invalid_type_test.rb b/test/bcdd/result/context/expectations/with_source/success/type_and_value/invalid_type_test.rb
similarity index 89%
rename from test/bcdd/result/context/expectations/with_subject/success/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/type_and_value/invalid_type_test.rb
index a52c7f3..39a6d62 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessTypeAndValueInvalidTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessTypeAndValueInvalidTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/context/expectations/with_subject/success/type_and_value/invalid_value_test.rb b/test/bcdd/result/context/expectations/with_source/success/type_and_value/invalid_value_test.rb
similarity index 89%
rename from test/bcdd/result/context/expectations/with_subject/success/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/type_and_value/invalid_value_test.rb
index ac9c4b1..89750c9 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/context/expectations/with_subject/success/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/context/expectations/with_source/success/type_and_value/pattern_matching_error_test.rb
similarity index 89%
rename from test/bcdd/result/context/expectations/with_subject/success/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/type_and_value/pattern_matching_error_test.rb
index e96648a..f561e28 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/context/expectations/with_subject/success/type_and_value_test.rb b/test/bcdd/result/context/expectations/with_source/success/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/success/type_and_value_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/type_and_value_test.rb
index 3e2d531..7e76c53 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/context/expectations/with_subject/success/type_test.rb b/test/bcdd/result/context/expectations/with_source/success/type_test.rb
similarity index 97%
rename from test/bcdd/result/context/expectations/with_subject/success/type_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/type_test.rb
index 88d5175..4bcd810 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: :ok
diff --git a/test/bcdd/result/context/expectations/with_subject/success/types/invalid_type_test.rb b/test/bcdd/result/context/expectations/with_source/success/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/context/expectations/with_subject/success/types/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/types/invalid_type_test.rb
index 15f9d0c..7249888 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/types/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessInvalidTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessInvalidTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: %i[ok1 ok2 ok3]
diff --git a/test/bcdd/result/context/expectations/with_subject/success/types_test.rb b/test/bcdd/result/context/expectations/with_source/success/types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/success/types_test.rb
rename to test/bcdd/result/context/expectations/with_source/success/types_test.rb
index 199cf30..8598e76 100644
--- a/test/bcdd/result/context/expectations/with_subject/success/types_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: %i[numbers division_completed]
diff --git a/test/bcdd/result/context/expectations/with_subject/success_and_failure/mixed/type_and_value_with_types_test.rb b/test/bcdd/result/context/expectations/with_source/success_and_failure/mixed/type_and_value_with_types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
rename to test/bcdd/result/context/expectations/with_source/success_and_failure/mixed/type_and_value_with_types_test.rb
index 07f6c3b..8697a97 100644
--- a/test/bcdd/result/context/expectations/with_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success_and_failure/mixed/type_and_value_with_types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/context/expectations/with_subject/success_and_failure/mixed/types_with_type_and_value_test.rb b/test/bcdd/result/context/expectations/with_source/success_and_failure/mixed/types_with_type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
rename to test/bcdd/result/context/expectations/with_source/success_and_failure/mixed/types_with_type_and_value_test.rb
index c9da6ce..fdae006 100644
--- a/test/bcdd/result/context/expectations/with_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success_and_failure/mixed/types_with_type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/context/expectations/with_subject/success_and_failure/type_and_value_test.rb b/test/bcdd/result/context/expectations/with_source/success_and_failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/success_and_failure/type_and_value_test.rb
rename to test/bcdd/result/context/expectations/with_source/success_and_failure/type_and_value_test.rb
index e7deb86..06391d8 100644
--- a/test/bcdd/result/context/expectations/with_subject/success_and_failure/type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success_and_failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessAndFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessAndFailureTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/context/expectations/with_subject/success_and_failure/type_test.rb b/test/bcdd/result/context/expectations/with_source/success_and_failure/type_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/success_and_failure/type_test.rb
rename to test/bcdd/result/context/expectations/with_source/success_and_failure/type_test.rb
index 69df6f1..5450661 100644
--- a/test/bcdd/result/context/expectations/with_subject/success_and_failure/type_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success_and_failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessAndFailureTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessAndFailureTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: :ok,
diff --git a/test/bcdd/result/context/expectations/with_subject/success_and_failure/types_test.rb b/test/bcdd/result/context/expectations/with_source/success_and_failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/with_subject/success_and_failure/types_test.rb
rename to test/bcdd/result/context/expectations/with_source/success_and_failure/types_test.rb
index 9bbc524..a35f63a 100644
--- a/test/bcdd/result/context/expectations/with_subject/success_and_failure/types_test.rb
+++ b/test/bcdd/result/context/expectations/with_source/success_and_failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithSubjectSuccessAndFailureTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithSourceSuccessAndFailureTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Context::Expectations.mixin(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/type/invalid_type_test.rb b/test/bcdd/result/context/expectations/without_source/failure/type/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/context/expectations/without_subject/failure/type/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/type/invalid_type_test.rb
index 12da9c5..883e76b 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/type/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureInvalidTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureInvalidTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       failure: :err
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value/invalid_type_test.rb b/test/bcdd/result/context/expectations/without_source/failure/type_and_value/invalid_type_test.rb
similarity index 93%
rename from test/bcdd/result/context/expectations/without_subject/failure/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/type_and_value/invalid_type_test.rb
index 9dab0b9..111b17c 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureInvalidTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureInvalidTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value/invalid_value_test.rb b/test/bcdd/result/context/expectations/without_source/failure/type_and_value/invalid_value_test.rb
similarity index 91%
rename from test/bcdd/result/context/expectations/without_subject/failure/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/type_and_value/invalid_value_test.rb
index 506c928..58807fc 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/context/expectations/without_source/failure/type_and_value/pattern_matching_error_test.rb
similarity index 91%
rename from test/bcdd/result/context/expectations/without_subject/failure/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/type_and_value/pattern_matching_error_test.rb
index 0f24541..fb39bc7 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value_test.rb b/test/bcdd/result/context/expectations/without_source/failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/failure/type_and_value_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/type_and_value_test.rb
index 593a80d..b69c8bc 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/type_test.rb b/test/bcdd/result/context/expectations/without_source/failure/type_test.rb
similarity index 97%
rename from test/bcdd/result/context/expectations/without_subject/failure/type_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/type_test.rb
index bb9347c..dcc1e66 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       failure: :err
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/types/invalid_type_test.rb b/test/bcdd/result/context/expectations/without_source/failure/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/context/expectations/without_subject/failure/types/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/types/invalid_type_test.rb
index 61ca27f..3174ecf 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/types/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureInvalidTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureInvalidTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       failure: %i[err1 err2]
diff --git a/test/bcdd/result/context/expectations/without_subject/failure/types_test.rb b/test/bcdd/result/context/expectations/without_source/failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/failure/types_test.rb
rename to test/bcdd/result/context/expectations/without_source/failure/types_test.rb
index 4706e45..cc5b8a4 100644
--- a/test/bcdd/result/context/expectations/without_subject/failure/types_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectFailureTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceFailureTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       failure: %i[invalid_arg division_by_zero]
diff --git a/test/bcdd/result/context/expectations/without_subject/success/type/invalid_type_test.rb b/test/bcdd/result/context/expectations/without_source/success/type/invalid_type_test.rb
similarity index 89%
rename from test/bcdd/result/context/expectations/without_subject/success/type/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/type/invalid_type_test.rb
index beb9b7f..0fafc74 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/type/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessInvalidTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessInvalidTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: :ok
diff --git a/test/bcdd/result/context/expectations/without_subject/success/type_and_value/invalid_type_test.rb b/test/bcdd/result/context/expectations/without_source/success/type_and_value/invalid_type_test.rb
similarity index 89%
rename from test/bcdd/result/context/expectations/without_subject/success/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/type_and_value/invalid_type_test.rb
index 7bfc283..bc5ac1f 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessTypeAndValueInvalidTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessTypeAndValueInvalidTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: {
diff --git a/test/bcdd/result/context/expectations/without_subject/success/type_and_value/invalid_value_test.rb b/test/bcdd/result/context/expectations/without_source/success/type_and_value/invalid_value_test.rb
similarity index 90%
rename from test/bcdd/result/context/expectations/without_subject/success/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/type_and_value/invalid_value_test.rb
index d52891e..1e45b31 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: {
diff --git a/test/bcdd/result/context/expectations/without_subject/success/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/context/expectations/without_source/success/type_and_value/pattern_matching_error_test.rb
similarity index 89%
rename from test/bcdd/result/context/expectations/without_subject/success/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/type_and_value/pattern_matching_error_test.rb
index da1ff60..ad3f447 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: {
diff --git a/test/bcdd/result/context/expectations/without_subject/success/type_and_value_test.rb b/test/bcdd/result/context/expectations/without_source/success/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/success/type_and_value_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/type_and_value_test.rb
index 20ddc38..851dd6a 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: {
diff --git a/test/bcdd/result/context/expectations/without_subject/success/type_test.rb b/test/bcdd/result/context/expectations/without_source/success/type_test.rb
similarity index 97%
rename from test/bcdd/result/context/expectations/without_subject/success/type_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/type_test.rb
index 483c9f7..64f3f7b 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: :ok
diff --git a/test/bcdd/result/context/expectations/without_subject/success/types/invalid_type_test.rb b/test/bcdd/result/context/expectations/without_source/success/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/context/expectations/without_subject/success/types/invalid_type_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/types/invalid_type_test.rb
index 503f629..7a7bd18 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/types/invalid_type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessInvalidTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessInvalidTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: %i[ok1 ok2 ok3]
diff --git a/test/bcdd/result/context/expectations/without_subject/success/types_test.rb b/test/bcdd/result/context/expectations/without_source/success/types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/success/types_test.rb
rename to test/bcdd/result/context/expectations/without_source/success/types_test.rb
index 83948cb..2cfc064 100644
--- a/test/bcdd/result/context/expectations/without_subject/success/types_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: %i[numbers division_completed]
diff --git a/test/bcdd/result/context/expectations/without_subject/success_and_failure/mixed/type_and_value_with_types_test.rb b/test/bcdd/result/context/expectations/without_source/success_and_failure/mixed/type_and_value_with_types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
rename to test/bcdd/result/context/expectations/without_source/success_and_failure/mixed/type_and_value_with_types_test.rb
index 9a82832..291c4fe 100644
--- a/test/bcdd/result/context/expectations/without_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success_and_failure/mixed/type_and_value_with_types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: {
diff --git a/test/bcdd/result/context/expectations/without_subject/success_and_failure/mixed/types_with_type_and_value_test.rb b/test/bcdd/result/context/expectations/without_source/success_and_failure/mixed/types_with_type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
rename to test/bcdd/result/context/expectations/without_source/success_and_failure/mixed/types_with_type_and_value_test.rb
index c83a263..b08fdfd 100644
--- a/test/bcdd/result/context/expectations/without_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success_and_failure/mixed/types_with_type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/context/expectations/without_subject/success_and_failure/type_and_value_test.rb b/test/bcdd/result/context/expectations/without_source/success_and_failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/success_and_failure/type_and_value_test.rb
rename to test/bcdd/result/context/expectations/without_source/success_and_failure/type_and_value_test.rb
index adafdab..c319d46 100644
--- a/test/bcdd/result/context/expectations/without_subject/success_and_failure/type_and_value_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success_and_failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessAndFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessAndFailureTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: {
diff --git a/test/bcdd/result/context/expectations/without_subject/success_and_failure/type_test.rb b/test/bcdd/result/context/expectations/without_source/success_and_failure/type_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/success_and_failure/type_test.rb
rename to test/bcdd/result/context/expectations/without_source/success_and_failure/type_test.rb
index f476a51..2f00191 100644
--- a/test/bcdd/result/context/expectations/without_subject/success_and_failure/type_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success_and_failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessAndFailureTypeTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessAndFailureTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: :ok,
diff --git a/test/bcdd/result/context/expectations/without_subject/success_and_failure/types_test.rb b/test/bcdd/result/context/expectations/without_source/success_and_failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/context/expectations/without_subject/success_and_failure/types_test.rb
rename to test/bcdd/result/context/expectations/without_source/success_and_failure/types_test.rb
index 76d1230..2343eca 100644
--- a/test/bcdd/result/context/expectations/without_subject/success_and_failure/types_test.rb
+++ b/test/bcdd/result/context/expectations/without_source/success_and_failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::Context::ExpectationsWithoutSubjectSuccessAndFailureTypesTest < Minitest::Test
+class BCDD::Result::Context::ExpectationsWithoutSourceSuccessAndFailureTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Context::Expectations.new(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/context/transitions/disabled/with_subject/flat_test.rb b/test/bcdd/result/context/transitions/disabled/with_source/flat_test.rb
similarity index 97%
rename from test/bcdd/result/context/transitions/disabled/with_subject/flat_test.rb
rename to test/bcdd/result/context/transitions/disabled/with_source/flat_test.rb
index 6ef8e3b..548980e 100644
--- a/test/bcdd/result/context/transitions/disabled/with_subject/flat_test.rb
+++ b/test/bcdd/result/context/transitions/disabled/with_source/flat_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsDisabledWithSubjectInstanceFlatTest < Minitest::Test
+  class Context::TransitionsDisabledWithSourceInstanceFlatTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     def setup
diff --git a/test/bcdd/result/context/transitions/disabled/with_subject/nested_test.rb b/test/bcdd/result/context/transitions/disabled/with_source/nested_test.rb
similarity index 97%
rename from test/bcdd/result/context/transitions/disabled/with_subject/nested_test.rb
rename to test/bcdd/result/context/transitions/disabled/with_source/nested_test.rb
index 905b6a3..2ed2199 100644
--- a/test/bcdd/result/context/transitions/disabled/with_subject/nested_test.rb
+++ b/test/bcdd/result/context/transitions/disabled/with_source/nested_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsDisabledWithSubjectInstanceNestedTest < Minitest::Test
+  class Context::TransitionsDisabledWithSourceInstanceNestedTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     def setup
diff --git a/test/bcdd/result/context/transitions/disabled/with_subject/recursion_test.rb b/test/bcdd/result/context/transitions/disabled/with_source/recursion_test.rb
similarity index 94%
rename from test/bcdd/result/context/transitions/disabled/with_subject/recursion_test.rb
rename to test/bcdd/result/context/transitions/disabled/with_source/recursion_test.rb
index f73c2a7..4a025f3 100644
--- a/test/bcdd/result/context/transitions/disabled/with_subject/recursion_test.rb
+++ b/test/bcdd/result/context/transitions/disabled/with_source/recursion_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsDisabledWithSubjectInstanceRecursionTest < Minitest::Test
+  class Context::TransitionsDisabledWithSourceInstanceRecursionTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     def setup
diff --git a/test/bcdd/result/context/transitions/disabled/without_subject/flat_test.rb b/test/bcdd/result/context/transitions/disabled/without_source/flat_test.rb
similarity index 96%
rename from test/bcdd/result/context/transitions/disabled/without_subject/flat_test.rb
rename to test/bcdd/result/context/transitions/disabled/without_source/flat_test.rb
index 2172cd0..f9683b2 100644
--- a/test/bcdd/result/context/transitions/disabled/without_subject/flat_test.rb
+++ b/test/bcdd/result/context/transitions/disabled/without_source/flat_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsDisabledWithoutSubjectInstanceFlatTest < Minitest::Test
+  class Context::TransitionsDisabledWithoutSourceInstanceFlatTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     def setup
diff --git a/test/bcdd/result/context/transitions/disabled/without_subject/nested_test.rb b/test/bcdd/result/context/transitions/disabled/without_source/nested_test.rb
similarity index 97%
rename from test/bcdd/result/context/transitions/disabled/without_subject/nested_test.rb
rename to test/bcdd/result/context/transitions/disabled/without_source/nested_test.rb
index 6c1c142..6cc6630 100644
--- a/test/bcdd/result/context/transitions/disabled/without_subject/nested_test.rb
+++ b/test/bcdd/result/context/transitions/disabled/without_source/nested_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsDisabledWithoutSubjectInstanceNestedTest < Minitest::Test
+  class Context::TransitionsDisabledWithoutSourceInstanceNestedTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     def setup
diff --git a/test/bcdd/result/context/transitions/disabled/without_subject/recursion_test.rb b/test/bcdd/result/context/transitions/disabled/without_source/recursion_test.rb
similarity index 94%
rename from test/bcdd/result/context/transitions/disabled/without_subject/recursion_test.rb
rename to test/bcdd/result/context/transitions/disabled/without_source/recursion_test.rb
index e5f69e8..3edd08f 100644
--- a/test/bcdd/result/context/transitions/disabled/without_subject/recursion_test.rb
+++ b/test/bcdd/result/context/transitions/disabled/without_source/recursion_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsDisabledWithoutSubjectInstanceRecursionTest < Minitest::Test
+  class Context::TransitionsDisabledWithoutSourceInstanceRecursionTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     def setup
diff --git a/test/bcdd/result/context/transitions/enabled/with_subject/instance/flat_test.rb b/test/bcdd/result/context/transitions/enabled/with_source/instance/flat_test.rb
similarity index 96%
rename from test/bcdd/result/context/transitions/enabled/with_subject/instance/flat_test.rb
rename to test/bcdd/result/context/transitions/enabled/with_source/instance/flat_test.rb
index e4a7b97..f6279c8 100644
--- a/test/bcdd/result/context/transitions/enabled/with_subject/instance/flat_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/with_source/instance/flat_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithSubjectInstanceFlatTest < Minitest::Test
+  class Context::TransitionsEnabledWithSourceInstanceFlatTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     class Division
diff --git a/test/bcdd/result/context/transitions/enabled/with_subject/instance/nested_test.rb b/test/bcdd/result/context/transitions/enabled/with_source/instance/nested_test.rb
similarity index 97%
rename from test/bcdd/result/context/transitions/enabled/with_subject/instance/nested_test.rb
rename to test/bcdd/result/context/transitions/enabled/with_source/instance/nested_test.rb
index 4f7d735..7a9e410 100644
--- a/test/bcdd/result/context/transitions/enabled/with_subject/instance/nested_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/with_source/instance/nested_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithSubjectInstanceNestedTest < Minitest::Test
+  class Context::TransitionsEnabledWithSourceInstanceNestedTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     class Division
diff --git a/test/bcdd/result/context/transitions/enabled/with_subject/instance/recursion_test.rb b/test/bcdd/result/context/transitions/enabled/with_source/instance/recursion_test.rb
similarity index 94%
rename from test/bcdd/result/context/transitions/enabled/with_subject/instance/recursion_test.rb
rename to test/bcdd/result/context/transitions/enabled/with_source/instance/recursion_test.rb
index a379dcf..06224fa 100644
--- a/test/bcdd/result/context/transitions/enabled/with_subject/instance/recursion_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/with_source/instance/recursion_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithSubjectInstanceRecursionTest < Minitest::Test
+  class Context::TransitionsEnabledWithSourceInstanceRecursionTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     class Fibonacci
diff --git a/test/bcdd/result/context/transitions/enabled/with_subject/singleton/flat_test.rb b/test/bcdd/result/context/transitions/enabled/with_source/singleton/flat_test.rb
similarity index 96%
rename from test/bcdd/result/context/transitions/enabled/with_subject/singleton/flat_test.rb
rename to test/bcdd/result/context/transitions/enabled/with_source/singleton/flat_test.rb
index 7d39f34..804f7b9 100644
--- a/test/bcdd/result/context/transitions/enabled/with_subject/singleton/flat_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/with_source/singleton/flat_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithSubjectSingletonFlatTest < Minitest::Test
+  class Context::TransitionsEnabledWithSourceSingletonFlatTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     module Division
diff --git a/test/bcdd/result/context/transitions/enabled/with_subject/singleton/nested_test.rb b/test/bcdd/result/context/transitions/enabled/with_source/singleton/nested_test.rb
similarity index 95%
rename from test/bcdd/result/context/transitions/enabled/with_subject/singleton/nested_test.rb
rename to test/bcdd/result/context/transitions/enabled/with_source/singleton/nested_test.rb
index bbb9331..988fd3f 100644
--- a/test/bcdd/result/context/transitions/enabled/with_subject/singleton/nested_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/with_source/singleton/nested_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithSubjectSingletonNestedTest < Minitest::Test
+  class Context::TransitionsEnabledWithSourceSingletonNestedTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     module Division
@@ -195,7 +195,7 @@ def divide_by_two(num)
         parent: root,
         current: { id: Integer, name: nil, desc: nil },
         result: { kind: :success, type: :continued, value: {} },
-        and_then: { type: :method, arg: { useless_arg: true }, subject: Division, method_name: :validate_nonzero }
+        and_then: { type: :method, arg: { useless_arg: true }, source: Division, method_name: :validate_nonzero }
       }.then { |spec| assert_transition_record(result, 2, spec) }
 
       {
@@ -203,7 +203,7 @@ def divide_by_two(num)
         parent: root,
         current: { id: Integer, name: nil, desc: nil },
         result: { kind: :success, type: :division_completed, value: { number: 10 } },
-        and_then: { type: :method, arg: {}, subject: Division, method_name: :divide }
+        and_then: { type: :method, arg: {}, source: Division, method_name: :divide }
       }.then { |spec| assert_transition_record(result, 3, spec) }
 
       # 3rd division transitions
@@ -225,7 +225,7 @@ def divide_by_two(num)
         parent: root,
         current: { id: Integer, name: nil, desc: nil },
         result: { kind: :success, type: :continued, value: {} },
-        and_then: { type: :method, arg: { useless_arg: true }, subject: Division, method_name: :validate_nonzero }
+        and_then: { type: :method, arg: { useless_arg: true }, source: Division, method_name: :validate_nonzero }
       }.then { |spec| assert_transition_record(result, 5, spec) }
 
       {
@@ -233,7 +233,7 @@ def divide_by_two(num)
         parent: root,
         current: { id: Integer, name: nil, desc: nil },
         result: { kind: :success, type: :division_completed, value: { number: 0 } },
-        and_then: { type: :method, arg: {}, subject: Division, method_name: :divide }
+        and_then: { type: :method, arg: {}, source: Division, method_name: :divide }
       }.then { |spec| assert_transition_record(result, 6, spec) }
 
       # Final result transition
diff --git a/test/bcdd/result/context/transitions/enabled/with_subject/singleton/recursion_test.rb b/test/bcdd/result/context/transitions/enabled/with_source/singleton/recursion_test.rb
similarity index 93%
rename from test/bcdd/result/context/transitions/enabled/with_subject/singleton/recursion_test.rb
rename to test/bcdd/result/context/transitions/enabled/with_source/singleton/recursion_test.rb
index 4143ef5..800892a 100644
--- a/test/bcdd/result/context/transitions/enabled/with_subject/singleton/recursion_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/with_source/singleton/recursion_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithSubjectSingletonRecursionTest < Minitest::Test
+  class Context::TransitionsEnabledWithSourceSingletonRecursionTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     module Fibonacci
diff --git a/test/bcdd/result/context/transitions/enabled/without_subject/instance/flat_test.rb b/test/bcdd/result/context/transitions/enabled/without_source/instance/flat_test.rb
similarity index 96%
rename from test/bcdd/result/context/transitions/enabled/without_subject/instance/flat_test.rb
rename to test/bcdd/result/context/transitions/enabled/without_source/instance/flat_test.rb
index 6f352b5..de1abfa 100644
--- a/test/bcdd/result/context/transitions/enabled/without_subject/instance/flat_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/without_source/instance/flat_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithoutSubjectInstanceFlatTest < Minitest::Test
+  class Context::TransitionsEnabledWithoutSourceInstanceFlatTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     class Division
diff --git a/test/bcdd/result/context/transitions/enabled/without_subject/instance/nested_test.rb b/test/bcdd/result/context/transitions/enabled/without_source/instance/nested_test.rb
similarity index 97%
rename from test/bcdd/result/context/transitions/enabled/without_subject/instance/nested_test.rb
rename to test/bcdd/result/context/transitions/enabled/without_source/instance/nested_test.rb
index 07eeb47..0583812 100644
--- a/test/bcdd/result/context/transitions/enabled/without_subject/instance/nested_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/without_source/instance/nested_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithoutSubjectInstanceNestedTest < Minitest::Test
+  class Context::TransitionsEnabledWithoutSourceInstanceNestedTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     class Division
diff --git a/test/bcdd/result/context/transitions/enabled/without_subject/instance/recursion_test.rb b/test/bcdd/result/context/transitions/enabled/without_source/instance/recursion_test.rb
similarity index 93%
rename from test/bcdd/result/context/transitions/enabled/without_subject/instance/recursion_test.rb
rename to test/bcdd/result/context/transitions/enabled/without_source/instance/recursion_test.rb
index 88f763f..623c5bc 100644
--- a/test/bcdd/result/context/transitions/enabled/without_subject/instance/recursion_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/without_source/instance/recursion_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithoutSubjectInstanceRecursionTest < Minitest::Test
+  class Context::TransitionsEnabledWithoutSourceInstanceRecursionTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     class Fibonacci
diff --git a/test/bcdd/result/context/transitions/enabled/without_subject/singleton/flat_test.rb b/test/bcdd/result/context/transitions/enabled/without_source/singleton/flat_test.rb
similarity index 96%
rename from test/bcdd/result/context/transitions/enabled/without_subject/singleton/flat_test.rb
rename to test/bcdd/result/context/transitions/enabled/without_source/singleton/flat_test.rb
index 54a36a9..5909071 100644
--- a/test/bcdd/result/context/transitions/enabled/without_subject/singleton/flat_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/without_source/singleton/flat_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithoutSubjectSingletonFlatTest < Minitest::Test
+  class Context::TransitionsEnabledWithoutSourceSingletonFlatTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     module Division
diff --git a/test/bcdd/result/context/transitions/enabled/without_subject/singleton/nested_test.rb b/test/bcdd/result/context/transitions/enabled/without_source/singleton/nested_test.rb
similarity index 97%
rename from test/bcdd/result/context/transitions/enabled/without_subject/singleton/nested_test.rb
rename to test/bcdd/result/context/transitions/enabled/without_source/singleton/nested_test.rb
index 699c058..20b975b 100644
--- a/test/bcdd/result/context/transitions/enabled/without_subject/singleton/nested_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/without_source/singleton/nested_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithoutSubjectSingletonNestedTest < Minitest::Test
+  class Context::TransitionsEnabledWithoutSourceSingletonNestedTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     module Division
diff --git a/test/bcdd/result/context/transitions/enabled/without_subject/singleton/recursion_test.rb b/test/bcdd/result/context/transitions/enabled/without_source/singleton/recursion_test.rb
similarity index 93%
rename from test/bcdd/result/context/transitions/enabled/without_subject/singleton/recursion_test.rb
rename to test/bcdd/result/context/transitions/enabled/without_source/singleton/recursion_test.rb
index 87451a3..108bcc0 100644
--- a/test/bcdd/result/context/transitions/enabled/without_subject/singleton/recursion_test.rb
+++ b/test/bcdd/result/context/transitions/enabled/without_source/singleton/recursion_test.rb
@@ -3,7 +3,7 @@
 require 'test_helper'
 
 class BCDD::Result
-  class Context::TransitionsEnabledWithoutSubjectSingletonRecursionTest < Minitest::Test
+  class Context::TransitionsEnabledWithoutSourceSingletonRecursionTest < Minitest::Test
     include BCDDResultTransitionAssertions
 
     module Fibonacci
diff --git a/test/bcdd/result/error_test.rb b/test/bcdd/result/error_test.rb
index 13fd051..bc10b12 100644
--- a/test/bcdd/result/error_test.rb
+++ b/test/bcdd/result/error_test.rb
@@ -42,36 +42,36 @@ class BCDD::Result::ErrorTest < Minitest::Test
     )
   end
 
-  test '::Error::InvalidResultSubject.build' do
-    assert BCDD::Result::Error::InvalidResultSubject < BCDD::Result::Error
+  test '::Error::InvalidResultSource.build' do
+    assert BCDD::Result::Error::InvalidResultSource < BCDD::Result::Error
 
-    given_result = BCDD::Result::Success.new(type: :number, value: 3, subject: 1)
+    given_result = BCDD::Result::Success.new(type: :number, value: 3, source: 1)
 
-    error_input = { given_result: given_result, expected_subject: 2 }
+    error_input = { given_result: given_result, expected_source: 2 }
 
     assert_equal(
-      "You cannot call #and_then and return a result that does not belong to the subject!\n" \
-      "Expected subject: 2\n" \
-      "Given subject: 1\n" \
+      "You cannot call #and_then and return a result that does not belong to the same source!\n" \
+      "Expected source: 2\n" \
+      "Given source: 1\n" \
       'Given result: #<BCDD::Result::Success type=:number value=3>',
-      BCDD::Result::Error::InvalidResultSubject.build(**error_input).message
+      BCDD::Result::Error::InvalidResultSource.build(**error_input).message
     )
   end
 
-  test '::Error::InvalidSubjectMethodArity.build' do
-    assert BCDD::Result::Error::InvalidSubjectMethodArity < BCDD::Result::Error
+  test '::Error::InvalidSourceMethodArity.build' do
+    assert BCDD::Result::Error::InvalidSourceMethodArity < BCDD::Result::Error
 
-    subject = Object.new
+    source = Object.new
 
-    def subject.do_something(_arg1, _arg2, _arg3); end
+    def source.do_something(_arg1, _arg2, _arg3); end
 
-    method = subject.method(:do_something)
+    method = source.method(:do_something)
 
-    error_input = { subject: subject, method: method, max_arity: 2 }
+    error_input = { source: source, method: method, max_arity: 2 }
 
     assert_equal(
       'Object#do_something has unsupported arity (3). Expected 0..2',
-      BCDD::Result::Error::InvalidSubjectMethodArity.build(**error_input).message
+      BCDD::Result::Error::InvalidSourceMethodArity.build(**error_input).message
     )
   end
 end
diff --git a/test/bcdd/result/expectations/with_subject/failure/type/invalid_type_test.rb b/test/bcdd/result/expectations/with_source/failure/type/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/with_subject/failure/type/invalid_type_test.rb
rename to test/bcdd/result/expectations/with_source/failure/type/invalid_type_test.rb
index 08792cd..46ea257 100644
--- a/test/bcdd/result/expectations/with_subject/failure/type/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureInvalidTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureInvalidTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: :err
diff --git a/test/bcdd/result/expectations/with_subject/failure/type_and_value/invalid_type_test.rb b/test/bcdd/result/expectations/with_source/failure/type_and_value/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/with_subject/failure/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/expectations/with_source/failure/type_and_value/invalid_type_test.rb
index 7a9aa54..c157329 100644
--- a/test/bcdd/result/expectations/with_subject/failure/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureInvalidTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureInvalidTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/expectations/with_subject/failure/type_and_value/invalid_value_test.rb b/test/bcdd/result/expectations/with_source/failure/type_and_value/invalid_value_test.rb
similarity index 89%
rename from test/bcdd/result/expectations/with_subject/failure/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/expectations/with_source/failure/type_and_value/invalid_value_test.rb
index 4e4a5c9..bd29aa8 100644
--- a/test/bcdd/result/expectations/with_subject/failure/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/expectations/with_subject/failure/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/expectations/with_source/failure/type_and_value/pattern_matching_error_test.rb
similarity index 90%
rename from test/bcdd/result/expectations/with_subject/failure/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/expectations/with_source/failure/type_and_value/pattern_matching_error_test.rb
index a2f843e..7c0f7da 100644
--- a/test/bcdd/result/expectations/with_subject/failure/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/expectations/with_subject/failure/type_and_value_test.rb b/test/bcdd/result/expectations/with_source/failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/failure/type_and_value_test.rb
rename to test/bcdd/result/expectations/with_source/failure/type_and_value_test.rb
index 34b8140..54e5bba 100644
--- a/test/bcdd/result/expectations/with_subject/failure/type_and_value_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: {
diff --git a/test/bcdd/result/expectations/with_subject/failure/type_test.rb b/test/bcdd/result/expectations/with_source/failure/type_test.rb
similarity index 97%
rename from test/bcdd/result/expectations/with_subject/failure/type_test.rb
rename to test/bcdd/result/expectations/with_source/failure/type_test.rb
index ece898a..58b4bea 100644
--- a/test/bcdd/result/expectations/with_subject/failure/type_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: :err
diff --git a/test/bcdd/result/expectations/with_subject/failure/types/invalid_type_test.rb b/test/bcdd/result/expectations/with_source/failure/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/with_subject/failure/types/invalid_type_test.rb
rename to test/bcdd/result/expectations/with_source/failure/types/invalid_type_test.rb
index 3fa1489..c47d94d 100644
--- a/test/bcdd/result/expectations/with_subject/failure/types/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureInvalidTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureInvalidTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: %i[err1 err2]
diff --git a/test/bcdd/result/expectations/with_subject/failure/types_test.rb b/test/bcdd/result/expectations/with_source/failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/failure/types_test.rb
rename to test/bcdd/result/expectations/with_source/failure/types_test.rb
index 2ffeb97..4d69288 100644
--- a/test/bcdd/result/expectations/with_subject/failure/types_test.rb
+++ b/test/bcdd/result/expectations/with_source/failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectFailureTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceFailureTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       failure: %i[invalid_arg division_by_zero]
diff --git a/test/bcdd/result/expectations/with_subject/success/type/invalid_type_test.rb b/test/bcdd/result/expectations/with_source/success/type/invalid_type_test.rb
similarity index 89%
rename from test/bcdd/result/expectations/with_subject/success/type/invalid_type_test.rb
rename to test/bcdd/result/expectations/with_source/success/type/invalid_type_test.rb
index fc24269..a3033f2 100644
--- a/test/bcdd/result/expectations/with_subject/success/type/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessInvalidTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessInvalidTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: :ok
diff --git a/test/bcdd/result/expectations/with_subject/success/type_and_value/invalid_type_test.rb b/test/bcdd/result/expectations/with_source/success/type_and_value/invalid_type_test.rb
similarity index 89%
rename from test/bcdd/result/expectations/with_subject/success/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/expectations/with_source/success/type_and_value/invalid_type_test.rb
index 0a5cabd..789d013 100644
--- a/test/bcdd/result/expectations/with_subject/success/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessTypeAndValueInvalidTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessTypeAndValueInvalidTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/expectations/with_subject/success/type_and_value/invalid_value_test.rb b/test/bcdd/result/expectations/with_source/success/type_and_value/invalid_value_test.rb
similarity index 89%
rename from test/bcdd/result/expectations/with_subject/success/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/expectations/with_source/success/type_and_value/invalid_value_test.rb
index c8728a4..a876de1 100644
--- a/test/bcdd/result/expectations/with_subject/success/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/expectations/with_subject/success/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/expectations/with_source/success/type_and_value/pattern_matching_error_test.rb
similarity index 90%
rename from test/bcdd/result/expectations/with_subject/success/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/expectations/with_source/success/type_and_value/pattern_matching_error_test.rb
index b85d576..b56cc16 100644
--- a/test/bcdd/result/expectations/with_subject/success/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/expectations/with_subject/success/type_and_value_test.rb b/test/bcdd/result/expectations/with_source/success/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/success/type_and_value_test.rb
rename to test/bcdd/result/expectations/with_source/success/type_and_value_test.rb
index 9eab73e..54a4c2b 100644
--- a/test/bcdd/result/expectations/with_subject/success/type_and_value_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/expectations/with_subject/success/type_test.rb b/test/bcdd/result/expectations/with_source/success/type_test.rb
similarity index 97%
rename from test/bcdd/result/expectations/with_subject/success/type_test.rb
rename to test/bcdd/result/expectations/with_source/success/type_test.rb
index 6af0ca7..b285a8d 100644
--- a/test/bcdd/result/expectations/with_subject/success/type_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: :ok
diff --git a/test/bcdd/result/expectations/with_subject/success/types/invalid_type_test.rb b/test/bcdd/result/expectations/with_source/success/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/with_subject/success/types/invalid_type_test.rb
rename to test/bcdd/result/expectations/with_source/success/types/invalid_type_test.rb
index 9c50fc9..85f59f1 100644
--- a/test/bcdd/result/expectations/with_subject/success/types/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessInvalidTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessInvalidTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: %i[ok1 ok2 ok3]
diff --git a/test/bcdd/result/expectations/with_subject/success/types_test.rb b/test/bcdd/result/expectations/with_source/success/types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/success/types_test.rb
rename to test/bcdd/result/expectations/with_source/success/types_test.rb
index 62c0eba..7c0486b 100644
--- a/test/bcdd/result/expectations/with_subject/success/types_test.rb
+++ b/test/bcdd/result/expectations/with_source/success/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: %i[numbers division_completed]
diff --git a/test/bcdd/result/expectations/with_subject/success_and_failure/mixed/type_and_value_with_types_test.rb b/test/bcdd/result/expectations/with_source/success_and_failure/mixed/type_and_value_with_types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
rename to test/bcdd/result/expectations/with_source/success_and_failure/mixed/type_and_value_with_types_test.rb
index 12047e6..9952c56 100644
--- a/test/bcdd/result/expectations/with_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
+++ b/test/bcdd/result/expectations/with_source/success_and_failure/mixed/type_and_value_with_types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/expectations/with_subject/success_and_failure/mixed/types_with_type_and_value_test.rb b/test/bcdd/result/expectations/with_source/success_and_failure/mixed/types_with_type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
rename to test/bcdd/result/expectations/with_source/success_and_failure/mixed/types_with_type_and_value_test.rb
index 3b12d4d..01a0271 100644
--- a/test/bcdd/result/expectations/with_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
+++ b/test/bcdd/result/expectations/with_source/success_and_failure/mixed/types_with_type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/expectations/with_subject/success_and_failure/type_and_value_test.rb b/test/bcdd/result/expectations/with_source/success_and_failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/success_and_failure/type_and_value_test.rb
rename to test/bcdd/result/expectations/with_source/success_and_failure/type_and_value_test.rb
index 2e6f3ea..6b0de85 100644
--- a/test/bcdd/result/expectations/with_subject/success_and_failure/type_and_value_test.rb
+++ b/test/bcdd/result/expectations/with_source/success_and_failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessAndFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessAndFailureTypeAndValueTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: {
diff --git a/test/bcdd/result/expectations/with_subject/success_and_failure/type_test.rb b/test/bcdd/result/expectations/with_source/success_and_failure/type_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/success_and_failure/type_test.rb
rename to test/bcdd/result/expectations/with_source/success_and_failure/type_test.rb
index 82d872e..b9af583 100644
--- a/test/bcdd/result/expectations/with_subject/success_and_failure/type_test.rb
+++ b/test/bcdd/result/expectations/with_source/success_and_failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessAndFailureTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessAndFailureTypeTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: :ok,
diff --git a/test/bcdd/result/expectations/with_subject/success_and_failure/types_test.rb b/test/bcdd/result/expectations/with_source/success_and_failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/with_subject/success_and_failure/types_test.rb
rename to test/bcdd/result/expectations/with_source/success_and_failure/types_test.rb
index b9128fb..13f47af 100644
--- a/test/bcdd/result/expectations/with_subject/success_and_failure/types_test.rb
+++ b/test/bcdd/result/expectations/with_source/success_and_failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithSubjectSuccessAndFailureTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithSourceSuccessAndFailureTypesTest < Minitest::Test
   class Divide
     include BCDD::Result::Expectations.mixin(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/expectations/without_subject/failure/type/invalid_type_test.rb b/test/bcdd/result/expectations/without_source/failure/type/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/without_subject/failure/type/invalid_type_test.rb
rename to test/bcdd/result/expectations/without_source/failure/type/invalid_type_test.rb
index 22c072e..f07a6c8 100644
--- a/test/bcdd/result/expectations/without_subject/failure/type/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureInvalidTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureInvalidTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: :err
diff --git a/test/bcdd/result/expectations/without_subject/failure/type_and_value/invalid_type_test.rb b/test/bcdd/result/expectations/without_source/failure/type_and_value/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/without_subject/failure/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/expectations/without_source/failure/type_and_value/invalid_type_test.rb
index d83c85b..1af03c6 100644
--- a/test/bcdd/result/expectations/without_subject/failure/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureInvalidTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureInvalidTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/expectations/without_subject/failure/type_and_value/invalid_value_test.rb b/test/bcdd/result/expectations/without_source/failure/type_and_value/invalid_value_test.rb
similarity index 89%
rename from test/bcdd/result/expectations/without_subject/failure/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/expectations/without_source/failure/type_and_value/invalid_value_test.rb
index 7e80f13..9d85348 100644
--- a/test/bcdd/result/expectations/without_subject/failure/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/expectations/without_subject/failure/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/expectations/without_source/failure/type_and_value/pattern_matching_error_test.rb
similarity index 90%
rename from test/bcdd/result/expectations/without_subject/failure/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/expectations/without_source/failure/type_and_value/pattern_matching_error_test.rb
index 55feb1f..7ab52d0 100644
--- a/test/bcdd/result/expectations/without_subject/failure/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/expectations/without_subject/failure/type_and_value_test.rb b/test/bcdd/result/expectations/without_source/failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/failure/type_and_value_test.rb
rename to test/bcdd/result/expectations/without_source/failure/type_and_value_test.rb
index ea9269c..1a8542a 100644
--- a/test/bcdd/result/expectations/without_subject/failure/type_and_value_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: {
diff --git a/test/bcdd/result/expectations/without_subject/failure/type_test.rb b/test/bcdd/result/expectations/without_source/failure/type_test.rb
similarity index 97%
rename from test/bcdd/result/expectations/without_subject/failure/type_test.rb
rename to test/bcdd/result/expectations/without_source/failure/type_test.rb
index 0542543..3d5d45f 100644
--- a/test/bcdd/result/expectations/without_subject/failure/type_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: :err
diff --git a/test/bcdd/result/expectations/without_subject/failure/types/invalid_type_test.rb b/test/bcdd/result/expectations/without_source/failure/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/without_subject/failure/types/invalid_type_test.rb
rename to test/bcdd/result/expectations/without_source/failure/types/invalid_type_test.rb
index 364b776..db27a73 100644
--- a/test/bcdd/result/expectations/without_subject/failure/types/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureInvalidTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureInvalidTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: %i[err1 err2]
diff --git a/test/bcdd/result/expectations/without_subject/failure/types_test.rb b/test/bcdd/result/expectations/without_source/failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/failure/types_test.rb
rename to test/bcdd/result/expectations/without_source/failure/types_test.rb
index 44a92d7..676a2e8 100644
--- a/test/bcdd/result/expectations/without_subject/failure/types_test.rb
+++ b/test/bcdd/result/expectations/without_source/failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectFailureTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceFailureTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       failure: %i[invalid_arg division_by_zero]
diff --git a/test/bcdd/result/expectations/without_subject/success/type/invalid_type_test.rb b/test/bcdd/result/expectations/without_source/success/type/invalid_type_test.rb
similarity index 90%
rename from test/bcdd/result/expectations/without_subject/success/type/invalid_type_test.rb
rename to test/bcdd/result/expectations/without_source/success/type/invalid_type_test.rb
index 8914771..641ab70 100644
--- a/test/bcdd/result/expectations/without_subject/success/type/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/type/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessInvalidTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessInvalidTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: :ok
diff --git a/test/bcdd/result/expectations/without_subject/success/type_and_value/invalid_type_test.rb b/test/bcdd/result/expectations/without_source/success/type_and_value/invalid_type_test.rb
similarity index 89%
rename from test/bcdd/result/expectations/without_subject/success/type_and_value/invalid_type_test.rb
rename to test/bcdd/result/expectations/without_source/success/type_and_value/invalid_type_test.rb
index 5162ddb..3dfe1e3 100644
--- a/test/bcdd/result/expectations/without_subject/success/type_and_value/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/type_and_value/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessTypeAndValueInvalidTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessTypeAndValueInvalidTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: {
diff --git a/test/bcdd/result/expectations/without_subject/success/type_and_value/invalid_value_test.rb b/test/bcdd/result/expectations/without_source/success/type_and_value/invalid_value_test.rb
similarity index 89%
rename from test/bcdd/result/expectations/without_subject/success/type_and_value/invalid_value_test.rb
rename to test/bcdd/result/expectations/without_source/success/type_and_value/invalid_value_test.rb
index e820d11..b72e990 100644
--- a/test/bcdd/result/expectations/without_subject/success/type_and_value/invalid_value_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/type_and_value/invalid_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessTypeAndValueInvalidValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessTypeAndValueInvalidValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: {
diff --git a/test/bcdd/result/expectations/without_subject/success/type_and_value/pattern_matching_error_test.rb b/test/bcdd/result/expectations/without_source/success/type_and_value/pattern_matching_error_test.rb
similarity index 90%
rename from test/bcdd/result/expectations/without_subject/success/type_and_value/pattern_matching_error_test.rb
rename to test/bcdd/result/expectations/without_source/success/type_and_value/pattern_matching_error_test.rb
index cd85ffb..ebd201b 100644
--- a/test/bcdd/result/expectations/without_subject/success/type_and_value/pattern_matching_error_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/type_and_value/pattern_matching_error_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessTypeAndValuePatterMatchingErrorTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: {
diff --git a/test/bcdd/result/expectations/without_subject/success/type_and_value_test.rb b/test/bcdd/result/expectations/without_source/success/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/success/type_and_value_test.rb
rename to test/bcdd/result/expectations/without_source/success/type_and_value_test.rb
index 17deb26..c79772b 100644
--- a/test/bcdd/result/expectations/without_subject/success/type_and_value_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: {
diff --git a/test/bcdd/result/expectations/without_subject/success/type_test.rb b/test/bcdd/result/expectations/without_source/success/type_test.rb
similarity index 97%
rename from test/bcdd/result/expectations/without_subject/success/type_test.rb
rename to test/bcdd/result/expectations/without_source/success/type_test.rb
index 2988074..740c0cd 100644
--- a/test/bcdd/result/expectations/without_subject/success/type_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: :ok
diff --git a/test/bcdd/result/expectations/without_subject/success/types/invalid_type_test.rb b/test/bcdd/result/expectations/without_source/success/types/invalid_type_test.rb
similarity index 92%
rename from test/bcdd/result/expectations/without_subject/success/types/invalid_type_test.rb
rename to test/bcdd/result/expectations/without_source/success/types/invalid_type_test.rb
index 443cdff..4e6083a 100644
--- a/test/bcdd/result/expectations/without_subject/success/types/invalid_type_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/types/invalid_type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessInvalidTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessInvalidTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: %i[ok1 ok2 ok3]
diff --git a/test/bcdd/result/expectations/without_subject/success/types_test.rb b/test/bcdd/result/expectations/without_source/success/types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/success/types_test.rb
rename to test/bcdd/result/expectations/without_source/success/types_test.rb
index ee1d723..f4b7270 100644
--- a/test/bcdd/result/expectations/without_subject/success/types_test.rb
+++ b/test/bcdd/result/expectations/without_source/success/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: %i[numbers division_completed]
diff --git a/test/bcdd/result/expectations/without_subject/success_and_failure/mixed/type_and_value_with_types_test.rb b/test/bcdd/result/expectations/without_source/success_and_failure/mixed/type_and_value_with_types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
rename to test/bcdd/result/expectations/without_source/success_and_failure/mixed/type_and_value_with_types_test.rb
index 92ea217..96a64b0 100644
--- a/test/bcdd/result/expectations/without_subject/success_and_failure/mixed/type_and_value_with_types_test.rb
+++ b/test/bcdd/result/expectations/without_source/success_and_failure/mixed/type_and_value_with_types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessAndFailureTypeAndValueWithTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: {
diff --git a/test/bcdd/result/expectations/without_subject/success_and_failure/mixed/types_with_type_and_value_test.rb b/test/bcdd/result/expectations/without_source/success_and_failure/mixed/types_with_type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
rename to test/bcdd/result/expectations/without_source/success_and_failure/mixed/types_with_type_and_value_test.rb
index 6d0526e..da9fb4d 100644
--- a/test/bcdd/result/expectations/without_subject/success_and_failure/mixed/types_with_type_and_value_test.rb
+++ b/test/bcdd/result/expectations/without_source/success_and_failure/mixed/types_with_type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessAndFailureTypesWithTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/expectations/without_subject/success_and_failure/type_and_value_test.rb b/test/bcdd/result/expectations/without_source/success_and_failure/type_and_value_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/success_and_failure/type_and_value_test.rb
rename to test/bcdd/result/expectations/without_source/success_and_failure/type_and_value_test.rb
index 94b9ab6..3c99d45 100644
--- a/test/bcdd/result/expectations/without_subject/success_and_failure/type_and_value_test.rb
+++ b/test/bcdd/result/expectations/without_source/success_and_failure/type_and_value_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessAndFailureTypeAndValueTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessAndFailureTypeAndValueTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: {
diff --git a/test/bcdd/result/expectations/without_subject/success_and_failure/type_test.rb b/test/bcdd/result/expectations/without_source/success_and_failure/type_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/success_and_failure/type_test.rb
rename to test/bcdd/result/expectations/without_source/success_and_failure/type_test.rb
index 4f96d2a..9305bb5 100644
--- a/test/bcdd/result/expectations/without_subject/success_and_failure/type_test.rb
+++ b/test/bcdd/result/expectations/without_source/success_and_failure/type_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessAndFailureTypeTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessAndFailureTypeTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: :ok,
diff --git a/test/bcdd/result/expectations/without_subject/success_and_failure/types_test.rb b/test/bcdd/result/expectations/without_source/success_and_failure/types_test.rb
similarity index 98%
rename from test/bcdd/result/expectations/without_subject/success_and_failure/types_test.rb
rename to test/bcdd/result/expectations/without_source/success_and_failure/types_test.rb
index 0866a44..d4a0f7e 100644
--- a/test/bcdd/result/expectations/without_subject/success_and_failure/types_test.rb
+++ b/test/bcdd/result/expectations/without_source/success_and_failure/types_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::ExpectationsWithoutSubjectSuccessAndFailureTypesTest < Minitest::Test
+class BCDD::Result::ExpectationsWithoutSourceSuccessAndFailureTypesTest < Minitest::Test
   class Divide
     Result = BCDD::Result::Expectations.new(
       success: %i[numbers division_completed],
diff --git a/test/bcdd/result/transitions/disabled/with_subject/flat_test.rb b/test/bcdd/result/transitions/disabled/with_source/flat_test.rb
similarity index 96%
rename from test/bcdd/result/transitions/disabled/with_subject/flat_test.rb
rename to test/bcdd/result/transitions/disabled/with_source/flat_test.rb
index 4877e4c..8d14e3c 100644
--- a/test/bcdd/result/transitions/disabled/with_subject/flat_test.rb
+++ b/test/bcdd/result/transitions/disabled/with_source/flat_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsDisabledWithSubjectFlatTest < Minitest::Test
+class BCDD::Result::TransitionsDisabledWithSourceFlatTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   def setup
diff --git a/test/bcdd/result/transitions/disabled/with_subject/nested_test.rb b/test/bcdd/result/transitions/disabled/with_source/nested_test.rb
similarity index 97%
rename from test/bcdd/result/transitions/disabled/with_subject/nested_test.rb
rename to test/bcdd/result/transitions/disabled/with_source/nested_test.rb
index 26dea9e..d8e7d04 100644
--- a/test/bcdd/result/transitions/disabled/with_subject/nested_test.rb
+++ b/test/bcdd/result/transitions/disabled/with_source/nested_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsDisabledWithSubjectNestedTest < Minitest::Test
+class BCDD::Result::TransitionsDisabledWithSourceNestedTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   def setup
diff --git a/test/bcdd/result/transitions/disabled/with_subject/recursion_test.rb b/test/bcdd/result/transitions/disabled/with_source/recursion_test.rb
similarity index 94%
rename from test/bcdd/result/transitions/disabled/with_subject/recursion_test.rb
rename to test/bcdd/result/transitions/disabled/with_source/recursion_test.rb
index c470876..6b7eaea 100644
--- a/test/bcdd/result/transitions/disabled/with_subject/recursion_test.rb
+++ b/test/bcdd/result/transitions/disabled/with_source/recursion_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsDisabledWithSubjectRecursionTest < Minitest::Test
+class BCDD::Result::TransitionsDisabledWithSourceRecursionTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   def setup
diff --git a/test/bcdd/result/transitions/disabled/without_subject/flat_test.rb b/test/bcdd/result/transitions/disabled/without_source/flat_test.rb
similarity index 96%
rename from test/bcdd/result/transitions/disabled/without_subject/flat_test.rb
rename to test/bcdd/result/transitions/disabled/without_source/flat_test.rb
index ccadd6b..d53d66d 100644
--- a/test/bcdd/result/transitions/disabled/without_subject/flat_test.rb
+++ b/test/bcdd/result/transitions/disabled/without_source/flat_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsDisabledWithoutSubjectFlatTest < Minitest::Test
+class BCDD::Result::TransitionsDisabledWithoutSourceFlatTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   def setup
diff --git a/test/bcdd/result/transitions/disabled/without_subject/nested_test.rb b/test/bcdd/result/transitions/disabled/without_source/nested_test.rb
similarity index 97%
rename from test/bcdd/result/transitions/disabled/without_subject/nested_test.rb
rename to test/bcdd/result/transitions/disabled/without_source/nested_test.rb
index da30823..0095613 100644
--- a/test/bcdd/result/transitions/disabled/without_subject/nested_test.rb
+++ b/test/bcdd/result/transitions/disabled/without_source/nested_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsDisabledWithoutSubjectNestedTest < Minitest::Test
+class BCDD::Result::TransitionsDisabledWithoutSourceNestedTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   def setup
diff --git a/test/bcdd/result/transitions/disabled/without_subject/recursion_test.rb b/test/bcdd/result/transitions/disabled/without_source/recursion_test.rb
similarity index 94%
rename from test/bcdd/result/transitions/disabled/without_subject/recursion_test.rb
rename to test/bcdd/result/transitions/disabled/without_source/recursion_test.rb
index d462ede..a187c9f 100644
--- a/test/bcdd/result/transitions/disabled/without_subject/recursion_test.rb
+++ b/test/bcdd/result/transitions/disabled/without_source/recursion_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsDisabledWithoutSubjectRecursionTest < Minitest::Test
+class BCDD::Result::TransitionsDisabledWithoutSourceRecursionTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   def setup
diff --git a/test/bcdd/result/transitions/enabled/with_subject/instance/flat_test.rb b/test/bcdd/result/transitions/enabled/with_source/instance/flat_test.rb
similarity index 93%
rename from test/bcdd/result/transitions/enabled/with_subject/instance/flat_test.rb
rename to test/bcdd/result/transitions/enabled/with_source/instance/flat_test.rb
index 9bfe0f5..24dfab9 100644
--- a/test/bcdd/result/transitions/enabled/with_subject/instance/flat_test.rb
+++ b/test/bcdd/result/transitions/enabled/with_source/instance/flat_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithSubjectInstanceFlatTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithSourceInstanceFlatTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   class Division
@@ -132,7 +132,7 @@ def divide((num1, num2))
 
     {
       result: { kind: :failure, type: :division_by_zero, value: 'num2 cannot be zero' },
-      and_then: { type: :method, arg: nil, subject: division3, method_name: :check_for_zeros }
+      and_then: { type: :method, arg: nil, source: division3, method_name: :check_for_zeros }
     }.then { |spec| assert_division_transition(result3, 1, spec) }
 
     # ---
@@ -148,7 +148,7 @@ def divide((num1, num2))
 
     {
       result: { kind: :success, type: :division_completed, value: 0 },
-      and_then: { type: :method, arg: nil, subject: division4, method_name: :check_for_zeros }
+      and_then: { type: :method, arg: nil, source: division4, method_name: :check_for_zeros }
     }.then { |spec| assert_division_transition(result4, 1, spec) }
 
     # ---
@@ -164,12 +164,12 @@ def divide((num1, num2))
 
     {
       result: { kind: :success, type: :continued, value: [4, 2] },
-      and_then: { type: :method, arg: nil, subject: division5, method_name: :check_for_zeros }
+      and_then: { type: :method, arg: nil, source: division5, method_name: :check_for_zeros }
     }.then { |spec| assert_division_transition(result5, 1, spec) }
 
     {
       result: { kind: :success, type: :division_completed, value: 2 },
-      and_then: { type: :method, arg: nil, subject: division5, method_name: :divide }
+      and_then: { type: :method, arg: nil, source: division5, method_name: :divide }
     }.then { |spec| assert_division_transition(result5, 2, spec) }
 
     # ---
diff --git a/test/bcdd/result/transitions/enabled/with_subject/instance/nested_test.rb b/test/bcdd/result/transitions/enabled/with_source/instance/nested_test.rb
similarity index 96%
rename from test/bcdd/result/transitions/enabled/with_subject/instance/nested_test.rb
rename to test/bcdd/result/transitions/enabled/with_source/instance/nested_test.rb
index 50aae29..db34c78 100644
--- a/test/bcdd/result/transitions/enabled/with_subject/instance/nested_test.rb
+++ b/test/bcdd/result/transitions/enabled/with_source/instance/nested_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithSubjectInstanceNestedTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithSourceInstanceNestedTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   class Division
@@ -222,7 +222,7 @@ def divide_by_two(num)
       parent: root,
       current: { id: Integer, name: 'Division', desc: nil },
       result: { kind: :success, type: :division_completed, value: 10 },
-      and_then: { type: :method, arg: 'useless_arg', subject: -> { _1.is_a?(Division) }, method_name: :divide }
+      and_then: { type: :method, arg: 'useless_arg', source: -> { _1.is_a?(Division) }, method_name: :divide }
     }.then { |spec| assert_transition_record(result, 4, spec) }
 
     # 3rd division transitions
@@ -258,7 +258,7 @@ def divide_by_two(num)
       parent: root,
       current: { id: Integer, name: 'Division', desc: nil },
       result: { kind: :success, type: :division_completed, value: 0 },
-      and_then: { type: :method, arg: 'useless_arg', subject: -> { _1.is_a?(Division) }, method_name: :divide }
+      and_then: { type: :method, arg: 'useless_arg', source: -> { _1.is_a?(Division) }, method_name: :divide }
     }.then { |spec| assert_transition_record(result, 8, spec) }
 
     # Final result transition
diff --git a/test/bcdd/result/transitions/enabled/with_subject/instance/recursion_test.rb b/test/bcdd/result/transitions/enabled/with_source/instance/recursion_test.rb
similarity index 92%
rename from test/bcdd/result/transitions/enabled/with_subject/instance/recursion_test.rb
rename to test/bcdd/result/transitions/enabled/with_source/instance/recursion_test.rb
index 1b4daa5..985194f 100644
--- a/test/bcdd/result/transitions/enabled/with_subject/instance/recursion_test.rb
+++ b/test/bcdd/result/transitions/enabled/with_source/instance/recursion_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithSubjectInstanceRecursionTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithSourceInstanceRecursionTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   class Fibonacci
diff --git a/test/bcdd/result/transitions/enabled/with_subject/singleton/flat_test.rb b/test/bcdd/result/transitions/enabled/with_source/singleton/flat_test.rb
similarity index 96%
rename from test/bcdd/result/transitions/enabled/with_subject/singleton/flat_test.rb
rename to test/bcdd/result/transitions/enabled/with_source/singleton/flat_test.rb
index ffe1e92..7c5cee7 100644
--- a/test/bcdd/result/transitions/enabled/with_subject/singleton/flat_test.rb
+++ b/test/bcdd/result/transitions/enabled/with_source/singleton/flat_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithSubjectSingletonFlatTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithSourceSingletonFlatTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   module Division
diff --git a/test/bcdd/result/transitions/enabled/with_subject/singleton/nested_test.rb b/test/bcdd/result/transitions/enabled/with_source/singleton/nested_test.rb
similarity index 98%
rename from test/bcdd/result/transitions/enabled/with_subject/singleton/nested_test.rb
rename to test/bcdd/result/transitions/enabled/with_source/singleton/nested_test.rb
index 64a8058..90e2143 100644
--- a/test/bcdd/result/transitions/enabled/with_subject/singleton/nested_test.rb
+++ b/test/bcdd/result/transitions/enabled/with_source/singleton/nested_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithSubjectSingletonNestedTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithSourceSingletonNestedTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   module CheckForZeros
diff --git a/test/bcdd/result/transitions/enabled/with_subject/singleton/recursion_test.rb b/test/bcdd/result/transitions/enabled/with_source/singleton/recursion_test.rb
similarity index 92%
rename from test/bcdd/result/transitions/enabled/with_subject/singleton/recursion_test.rb
rename to test/bcdd/result/transitions/enabled/with_source/singleton/recursion_test.rb
index 87c4fcd..9b1d0af 100644
--- a/test/bcdd/result/transitions/enabled/with_subject/singleton/recursion_test.rb
+++ b/test/bcdd/result/transitions/enabled/with_source/singleton/recursion_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithSubjectSingletonRecursionTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithSourceSingletonRecursionTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   module Fibonacci
diff --git a/test/bcdd/result/transitions/enabled/without_subject/instance/flat_test.rb b/test/bcdd/result/transitions/enabled/without_source/instance/flat_test.rb
similarity index 96%
rename from test/bcdd/result/transitions/enabled/without_subject/instance/flat_test.rb
rename to test/bcdd/result/transitions/enabled/without_source/instance/flat_test.rb
index 5960384..2ecb29f 100644
--- a/test/bcdd/result/transitions/enabled/without_subject/instance/flat_test.rb
+++ b/test/bcdd/result/transitions/enabled/without_source/instance/flat_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithoutSubjectInstanceFlatTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithoutSourceInstanceFlatTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   class Division
diff --git a/test/bcdd/result/transitions/enabled/without_subject/instance/nested_test.rb b/test/bcdd/result/transitions/enabled/without_source/instance/nested_test.rb
similarity index 97%
rename from test/bcdd/result/transitions/enabled/without_subject/instance/nested_test.rb
rename to test/bcdd/result/transitions/enabled/without_source/instance/nested_test.rb
index 3ab3333..f4eaf68 100644
--- a/test/bcdd/result/transitions/enabled/without_subject/instance/nested_test.rb
+++ b/test/bcdd/result/transitions/enabled/without_source/instance/nested_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithoutSubjectInstanceNestedTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithoutSourceInstanceNestedTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   class Division
diff --git a/test/bcdd/result/transitions/enabled/without_subject/instance/recursion_test.rb b/test/bcdd/result/transitions/enabled/without_source/instance/recursion_test.rb
similarity index 92%
rename from test/bcdd/result/transitions/enabled/without_subject/instance/recursion_test.rb
rename to test/bcdd/result/transitions/enabled/without_source/instance/recursion_test.rb
index 6ee0a1c..06128bb 100644
--- a/test/bcdd/result/transitions/enabled/without_subject/instance/recursion_test.rb
+++ b/test/bcdd/result/transitions/enabled/without_source/instance/recursion_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithoutSubjectInstanceRecursionTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithoutSourceInstanceRecursionTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   class Fibonacci
diff --git a/test/bcdd/result/transitions/enabled/without_subject/singleton/flat_test.rb b/test/bcdd/result/transitions/enabled/without_source/singleton/flat_test.rb
similarity index 96%
rename from test/bcdd/result/transitions/enabled/without_subject/singleton/flat_test.rb
rename to test/bcdd/result/transitions/enabled/without_source/singleton/flat_test.rb
index fe4733c..8d8fdd1 100644
--- a/test/bcdd/result/transitions/enabled/without_subject/singleton/flat_test.rb
+++ b/test/bcdd/result/transitions/enabled/without_source/singleton/flat_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithoutSubjectSingletonFlatTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithoutSourceSingletonFlatTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   module Division
diff --git a/test/bcdd/result/transitions/enabled/without_subject/singleton/nested_test.rb b/test/bcdd/result/transitions/enabled/without_source/singleton/nested_test.rb
similarity index 97%
rename from test/bcdd/result/transitions/enabled/without_subject/singleton/nested_test.rb
rename to test/bcdd/result/transitions/enabled/without_source/singleton/nested_test.rb
index 5ba4516..11c3902 100644
--- a/test/bcdd/result/transitions/enabled/without_subject/singleton/nested_test.rb
+++ b/test/bcdd/result/transitions/enabled/without_source/singleton/nested_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithoutSubjectSingletonNestedTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithoutSourceSingletonNestedTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   module Division
diff --git a/test/bcdd/result/transitions/enabled/without_subject/singleton/recursion_test.rb b/test/bcdd/result/transitions/enabled/without_source/singleton/recursion_test.rb
similarity index 92%
rename from test/bcdd/result/transitions/enabled/without_subject/singleton/recursion_test.rb
rename to test/bcdd/result/transitions/enabled/without_source/singleton/recursion_test.rb
index 07e0beb..1f26e97 100644
--- a/test/bcdd/result/transitions/enabled/without_subject/singleton/recursion_test.rb
+++ b/test/bcdd/result/transitions/enabled/without_source/singleton/recursion_test.rb
@@ -2,7 +2,7 @@
 
 require 'test_helper'
 
-class BCDD::Result::TransitionsEnabledWithoutSubjectSingletonRecursionTest < Minitest::Test
+class BCDD::Result::TransitionsEnabledWithoutSourceSingletonRecursionTest < Minitest::Test
   include BCDDResultTransitionAssertions
 
   module Fibonacci