diff --git a/description.lua b/description.lua
index 1f65a62..6dbd996 100644
--- a/description.lua
+++ b/description.lua
@@ -1,4 +1,4 @@
-version = "0.6.1"
+version = "0.6.2"
 license = "GPL"
 package = "sysdyn"
 depends = "terrame (>= 2.0), sci (>= 0.3)"
diff --git a/images/coffee.bmp b/images/coffee.bmp
new file mode 100644
index 0000000..febd5c8
Binary files /dev/null and b/images/coffee.bmp differ
diff --git a/images/coffee.lua b/images/coffee.lua
new file mode 100644
index 0000000..087b5a1
--- /dev/null
+++ b/images/coffee.lua
@@ -0,0 +1,10 @@
+
+import("sysdyn")
+
+c = Coffee{}
+
+c:run()
+
+c.chart:save("coffee.bmp")
+clean()
+
diff --git a/log/mac/Coffee-chart-1.bmp b/log/mac/Coffee-chart-1.bmp
new file mode 100644
index 0000000..febd5c8
Binary files /dev/null and b/log/mac/Coffee-chart-1.bmp differ
diff --git a/log/mac/Daisyworld-chart-1.bmp b/log/mac/Daisyworld-chart-1.bmp
new file mode 100644
index 0000000..09f3bc6
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diff --git a/log/mac/Daisyworld-chart-2.bmp b/log/mac/Daisyworld-chart-2.bmp
new file mode 100644
index 0000000..5885acf
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diff --git a/log/mac/Daisyworld-chart-3.bmp b/log/mac/Daisyworld-chart-3.bmp
new file mode 100644
index 0000000..e3de3bd
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diff --git a/log/mac/Daisyworld-chart-4.bmp b/log/mac/Daisyworld-chart-4.bmp
new file mode 100644
index 0000000..91d60cb
Binary files /dev/null and b/log/mac/Daisyworld-chart-4.bmp differ
diff --git a/log/mac/SIR-chart-1.bmp b/log/mac/SIR-chart-1.bmp
new file mode 100644
index 0000000..1a5598a
Binary files /dev/null and b/log/mac/SIR-chart-1.bmp differ
diff --git a/log/mac/population-growth.png b/log/mac/population-growth.png
index 053d93a..71d28e4 100644
Binary files a/log/mac/population-growth.png and b/log/mac/population-growth.png differ
diff --git a/log/mac/predator-prey-1.png b/log/mac/predator-prey-1.png
index f5ec9c2..218c5c1 100644
Binary files a/log/mac/predator-prey-1.png and b/log/mac/predator-prey-1.png differ
diff --git a/log/mac/predator-prey-2.png b/log/mac/predator-prey-2.png
index 4b358e6..4b36cc7 100644
Binary files a/log/mac/predator-prey-2.png and b/log/mac/predator-prey-2.png differ
diff --git a/lua/ChaoticGrowth.lua b/lua/ChaoticGrowth.lua
index b29af41..daaf563 100644
--- a/lua/ChaoticGrowth.lua
+++ b/lua/ChaoticGrowth.lua
@@ -1,13 +1,7 @@
 --- A Model that describes a chaotic population growth.
 -- @arg data.pop The initial population. The default value is 0.1.
 -- @arg data.rate The rate that multiplies the population size in each time step. The degault value is 4.
--- @arg data.deltaTime A numeric value with the period to execute the changes of
--- the model. The default value is one.
--- @arg data.updateTime A numeric value with the period to update the charts.
--- The default value is one.
 -- @arg data.finalTime The final time of the simulation. The default value is 300.
--- @arg data.view A table with two boolean elements, timeSeries and cobWeb (default true),
--- indicating whether a time series charts should be drawn.
 -- @image chaotic-growth.bmp
 ChaoticGrowth = Model{
 	pop       = 0.10,
diff --git a/lua/Daisyworld.lua b/lua/Daisyworld.lua
index 953676e..dbf7b80 100644
--- a/lua/Daisyworld.lua
+++ b/lua/Daisyworld.lua
@@ -72,11 +72,15 @@ end
 -- white according to their reflectivity or albedo.
 -- @arg data.sunLuminosity Sun luminosity (this is the main variable of the model).
 -- Values beteween 0.70 and 1.6  support life in Daisyworld.
+-- @arg data.daisyArea The initial daisy area, which is the sum of white and
+-- black areas. The default value is 0.673.
 -- @arg data.planetArea The total area of the planet. The sum of the arguments
 -- whiteArea, blackArea, and emptyArea should be equals to this value. The default value is 1.
 -- @arg data.whiteArea The initial area of white daisies. The default value is 0.4.
 -- @arg data.blackArea The initial area of black daisies. The default value is 0.273.
 -- @arg data.emptyArea The initial empty area. The default value is 0.327.
+-- @arg data.planetAlbedo The initial planet albedo, which is a weighted sum
+-- based on the areas of daisies and their albedos.
 -- @arg data.whiteAlbedo The albedo of white area. The default value is 0.75.
 -- @arg data.blackAlbedo The albedo of black area. The default value is 0.25.
 -- @arg data.soilAlbedo The albedo of empty area. The default value is 0.5.
diff --git a/lua/LimitedGrowth.lua b/lua/LimitedGrowth.lua
index 0603f16..b157d4c 100644
--- a/lua/LimitedGrowth.lua
+++ b/lua/LimitedGrowth.lua
@@ -3,8 +3,6 @@
 -- @arg data.rate The growth rate of the population.
 -- @arg data.capacity The maximum amount of individuals.
 -- @arg data.finalTime The number of simulation steps.
--- @arg data.view A table with a boolean element timeSeries (default true) indicating whether
--- a time series chart should be drawn.
 -- @image limited-growth.bmp
 LimitedGrowth = Model{
 	pop    = 300,
diff --git a/lua/MonoLake.lua b/lua/MonoLake.lua
index b6135ff..3e8d783 100644
--- a/lua/MonoLake.lua
+++ b/lua/MonoLake.lua
@@ -64,8 +64,6 @@ end
 -- @arg data.evapRate The evaporation rate in feet/year.
 -- @arg data.otherOut Other output of water from the lake in KAF/year.
 -- @arg data.finalTime The final time of the simulation. The default value is 50.
--- @arg data.view A table with a boolean element timeSeries (default true) indicating whether
--- a time series chart should be drawn.
 -- @image monolake.bmp
 MonoLake = Model{
 	waterInLake   = 2228.0,  -- kiloAcre * feet 
diff --git a/lua/PredatorPrey.lua b/lua/PredatorPrey.lua
index f712ddc..c604faf 100644
--- a/lua/PredatorPrey.lua
+++ b/lua/PredatorPrey.lua
@@ -43,6 +43,8 @@ PredatorPrey = Model{
 			xAxis = "prey"
 		}
 
+		if model.period == 1 then model.period = nil end
+
 		model.timer = Timer{
 			Event{action = model, period = model.period},
 			Event{action = model.chart1},
diff --git a/lua/RandomWalk.lua b/lua/RandomWalk.lua
index 6026e90..5c715f7 100644
--- a/lua/RandomWalk.lua
+++ b/lua/RandomWalk.lua
@@ -5,12 +5,6 @@
 -- time step. The available values are 0, 0.3, 0.5 (default), 0.7, 0.95, and 1.
 -- @arg data.finalTime The final time of the simulation. It should be
 -- at least 10. The default value is 100.
--- @arg data.deltaTime A numeric value with the period to execute the changes of
--- the model. The default value is one.
--- @arg data.updateTime A numeric value with the period to update the charts.
--- The default value is one.
--- @arg data.view A table with a boolean element timeSeries (default true) indicating whether
--- a time series chart should be drawn.
 -- @image random-walk.bmp
 RandomWalk = Model{
 	value = 0,
diff --git a/lua/RoomTemperature.lua b/lua/RoomTemperature.lua
index 20d9221..8d52f14 100644
--- a/lua/RoomTemperature.lua
+++ b/lua/RoomTemperature.lua
@@ -1,8 +1,4 @@
 --- Simple model that simulates the temperature of three rooms.
--- @arg data.temperature1 The initial temperature of the first room. The default value is 80.
--- @arg data.temperature2 The initial temperature of the second room. The default value is 20.
--- @arg data.temperature3 The initial temperature of the third room. The default value is 5.
--- @arg data.exterior The temperature outside the rooms. The default value is 20.
 -- @arg data.finalTime The final time of the simulation. The default value is 100.
 -- @arg data.outside The temperature outside the room. The default value is 1.
 -- @arg data.inside The temperature inside the room. The default initial value is 15.
@@ -12,8 +8,6 @@
 -- @arg data.thermalInertia The percentage of input heat every time step according to the
 -- difference between the temperature inside the room and the one selected in the thermostat.
 -- The default value is 0.3.
--- @arg data.view A table with a boolean element timeSeries (default true) indicating whether
--- a time series chart should be drawn.
 -- @image room-temperature.bmp
 RoomTemperature = Model{
 	tempSet     = 20.0,
diff --git a/tests/Coffee.lua b/tests/Coffee.lua
new file mode 100644
index 0000000..7402a8e
--- /dev/null
+++ b/tests/Coffee.lua
@@ -0,0 +1,13 @@
+-- Test file for Coffee.lua
+-- Author: Gilberto Camara and Pedro R. Andrade
+
+return{
+	Coffee = function(unitTest)
+		local model = Coffee{}
+
+		model:run()
+
+		unitTest:assertSnapshot(model.chart, "Coffee-chart-1.bmp")
+	end,
+}
+
diff --git a/tests/Daisyworld.lua b/tests/Daisyworld.lua
index e937416..0921e19 100644
--- a/tests/Daisyworld.lua
+++ b/tests/Daisyworld.lua
@@ -6,7 +6,11 @@ return{
 		local model = Daisyworld{}
 
 		model:run()
-		unitTest:assertSnapshot(model.chart, "daisyworld.png")
+
+		unitTest:assertSnapshot(model.chart1, "Daisyworld-chart-1.bmp")
+		unitTest:assertSnapshot(model.chart2, "Daisyworld-chart-2.bmp")
+		unitTest:assertSnapshot(model.chart3, "Daisyworld-chart-3.bmp")
+		unitTest:assertSnapshot(model.chart4, "Daisyworld-chart-4.bmp")
 	end,
 }
 
diff --git a/tests/PopulationGrowth.lua b/tests/PopulationGrowth.lua
index 24958cc..7e5155b 100644
--- a/tests/PopulationGrowth.lua
+++ b/tests/PopulationGrowth.lua
@@ -5,7 +5,7 @@ return{
 	PopulationGrowth = function(unitTest)
 		local p = PopulationGrowth{}
 		p:run()
-		unitTest:assertEquals(p.growthChange, 0.8, 0.01)
+		unitTest:assertEquals(p.growthChange, 1, 0.01)
 		unitTest:assertSnapshot(p.chart, "population-growth.png")
 	end,
 }
diff --git a/tests/PredatorPrey.lua b/tests/PredatorPrey.lua
index bf2a782..5901d7b 100644
--- a/tests/PredatorPrey.lua
+++ b/tests/PredatorPrey.lua
@@ -6,7 +6,7 @@ return{
 		local p = PredatorPrey{}
 		p:run()
 		
-		unitTest:assertEquals(p.wolves, 41, 0.1)
+		unitTest:assertEquals(p.predator, 41, 0.1)
 		unitTest:assertSnapshot(p.chart1, "predator-prey-1.png")
 		unitTest:assertSnapshot(p.chart2, "predator-prey-2.png")
 	end,
diff --git a/tests/SIR.lua b/tests/SIR.lua
new file mode 100644
index 0000000..e823baa
--- /dev/null
+++ b/tests/SIR.lua
@@ -0,0 +1,13 @@
+-- Test file for SIR.lua
+-- Author: Gilberto Camara and Pedro R. Andrade
+
+return{
+	SIR = function(unitTest)
+		local model = SIR{}
+
+		model:run()
+
+		unitTest:assertSnapshot(model.chart, "SIR-chart-1.bmp")
+	end,
+}
+