diff --git a/.gitignore b/.gitignore
index aa592830..507ff6e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ dist/
 # Installer logs
 pip-log.txt
 pip-delete-this-directory.txt
+build/
 
 # Sphinx documentation
 docs/build/
diff --git a/wfcommons/wfchef/wfchef_abstract_recipe.py b/wfcommons/wfchef/wfchef_abstract_recipe.py
index 40be9aed..83c61fe1 100644
--- a/wfcommons/wfchef/wfchef_abstract_recipe.py
+++ b/wfcommons/wfchef/wfchef_abstract_recipe.py
@@ -17,6 +17,7 @@
 
 from logging import Logger
 from typing import Any, Dict, List, Optional, Set, Union
+from wfcommons.common.task import Task
 from wfcommons.common.workflow import Workflow
 from wfcommons.wfchef.duplicate import duplicate
 from wfcommons.wfgen.abstract_recipe import WorkflowRecipe
@@ -31,6 +32,7 @@ class BaseMethod(Enum):
     BIGGEST = 2
     RANDOM = 3
 
+
 this_dir = pathlib.Path(__file__).resolve().parent
 
 
@@ -116,11 +118,12 @@ def from_num_tasks(cls,
         :rtype: WfChefWorkflowRecipe
     
        """
-        return cls(num_tasks=num_tasks, exclude_graphs=exclude_graphs, runtime_factor=runtime_factor,
+        return cls(num_tasks=num_tasks,
+                   exclude_graphs=exclude_graphs,
+                   runtime_factor=runtime_factor,
                    input_file_size_factor=input_file_size_factor,
                    output_file_size_factor=output_file_size_factor)
 
-
     def generate_nx_graph(self) -> nx.DiGraph:
         summary_path = self.this_dir.joinpath("microstructures", "summary.json")
         summary = json.loads(summary_path.read_text())
@@ -135,24 +138,24 @@ def generate_nx_graph(self) -> nx.DiGraph:
         reference_orders = [summary["base_graphs"][col]["order"] for col in df.columns]
         idx = np.argmin([abs(self.num_tasks - ref_num_tasks) for ref_num_tasks in reference_orders])
         reference = df.columns[idx]
-         
+
         if self.base_method == BaseMethod.ERROR_TABLE:
             base = df.index[df[reference].argmin()]
         elif self.base_method == BaseMethod.SMALLEST:
-            base =  min(
+            base = min(
                 [k for k in summary["base_graphs"].keys() if summary["base_graphs"][k] not in self.exclude_graphs],
                 key=lambda k: summary["base_graphs"][k]["order"]
             )
         elif self.base_method == BaseMethod.BIGGEST:
             base = max(
-                [k for k in summary["base_graphs"].keys() if summary["base_graphs"][k]["order"] <= self.num_tasks and 
-                summary["base_graphs"][k] not in self.exclude_graphs], 
+                [k for k in summary["base_graphs"].keys() if summary["base_graphs"][k]["order"] <= self.num_tasks and
+                 summary["base_graphs"][k] not in self.exclude_graphs],
                 key=lambda k: summary["base_graphs"][k]["order"]
             )
         else:
             base = random.choice(
-                [k for k in summary["base_graphs"].keys() if summary["base_graphs"][k]["order"] <= self.num_tasks and 
-                summary["base_graphs"][k] not in self.exclude_graphs]
+                [k for k in summary["base_graphs"].keys() if summary["base_graphs"][k]["order"] <= self.num_tasks and
+                 summary["base_graphs"][k] not in self.exclude_graphs]
             )
 
         graph = duplicate(self.this_dir.joinpath("microstructures"), base, self.num_tasks)
@@ -167,7 +170,8 @@ def build_workflow(self, workflow_name: Optional[str] = None) -> Workflow:
         :return: A synthetic workflow instance object.
         :rtype: Workflow
         """
-        workflow = Workflow(name=self.name + "-synthetic-instance" if not workflow_name else workflow_name, makespan=None)
+        workflow = Workflow(name=self.name + "-synthetic-instance" if not workflow_name else workflow_name,
+                            makespan=0)
         graph = self.generate_nx_graph()
 
         task_names = {}
@@ -181,11 +185,30 @@ def build_workflow(self, workflow_name: Optional[str] = None) -> Workflow:
 
             task_names[node] = task_name
 
+        # tasks dependencies
         for (src, dst) in graph.edges:
             if src in ["SRC", "DST"] or dst in ["SRC", "DST"]:
                 continue
             workflow.add_edge(task_names[src], task_names[dst])
 
+            if task_names[src] not in self.tasks_children:
+                self.tasks_children[task_names[src]] = []
+            if task_names[dst] not in self.tasks_parents:
+                self.tasks_parents[task_names[dst]] = []
+
+            self.tasks_children[task_names[src]].append(task_names[dst])
+            self.tasks_parents[task_names[dst]].append(task_names[src])
+
+        # find leaf tasks
+        leaf_tasks = []
+        for node_name in workflow.nodes:
+            task: Task = workflow.nodes[node_name]['task']
+            if task.name not in self.tasks_children:
+                leaf_tasks.append(task)
+
+        for task in leaf_tasks:
+            self._generate_task_files(task)
+
         workflow.nxgraph = graph
         self.workflows.append(workflow)
         return workflow
@@ -195,5 +218,3 @@ def _load_base_graph(self) -> nx.DiGraph:
 
     def _load_microstructures(self) -> Dict:
         return json.loads(self.this_dir.joinpath("microstructures.json").read_text())
-
-
diff --git a/wfcommons/wfgen/abstract_recipe.py b/wfcommons/wfgen/abstract_recipe.py
index 7656346a..fe092b67 100644
--- a/wfcommons/wfgen/abstract_recipe.py
+++ b/wfcommons/wfgen/abstract_recipe.py
@@ -67,6 +67,9 @@ def __init__(self, name: str,
         self.tasks_files: Dict[str, List[File]] = {}
         self.tasks_files_names: Dict[str, List[str]] = {}
         self.task_id_counter = 1
+        self.tasks_map = {}
+        self.tasks_children = {}
+        self.tasks_parents = {}
 
     @abstractmethod
     def _workflow_recipe(self) -> Dict[str, Any]: