diff --git a/bopytex/scheduler.py b/bopytex/scheduler.py
index 0e22d98..212c726 100644
--- a/bopytex/scheduler.py
+++ b/bopytex/scheduler.py
@@ -5,8 +5,9 @@ from bopytex.tasks import Task
 
 
 class Scheduler:
-    def __init__(self, actions: dict, done: list[str] = None):
-        self.actions = actions
+    """Scheduler is responsible of getting tasks (the tasks) and yield those that can be done"""
+
+    def __init__(self, done: list[str] = None):
 
         if done is None:
             self._done = []
@@ -17,12 +18,12 @@ class Scheduler:
 
     @property
     def tasks(self) -> list[Task]:
-        """ list all the tasks """
+        """List all the tasks todo"""
         return self._tasks
 
     @property
     def doable_tasks(self) -> list[Task]:
-        """ list all doable tasks """
+        """List all doable tasks"""
         return [
             task
             for task in self.tasks
@@ -31,12 +32,12 @@ class Scheduler:
 
     @property
     def all_deps(self) -> list[str]:
-        """ List dependencies of all tasks """
+        """List dependencies of all tasks"""
         return {d for task in self.tasks for d in task.deps}
 
     @property
     def all_output(self) -> list[str]:
-        """ List ouput of all tasks """
+        """List ouput of all tasks"""
         return {task.output for task in self.tasks}
 
     @property
@@ -46,31 +47,20 @@ class Scheduler:
     def append(self, tasks: list[Task]):
         self._tasks += tasks
 
-    def dispatch(self, task):
-        """Do a task"""
-        ans = self.actions[task.action](task.deps, task.args, task.output)
-        return ans
+    def is_finishable(self):
+        return self.all_deps.issubset(self.all_output)
 
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        return self.next()
-
-    def next(self):
+    def next_task(self):
         try:
             task = self.doable_tasks[0]
         except IndexError:
             raise StopIteration
 
-        ans = self.dispatch(task)
         self._done.append(task.output)
         self._tasks.remove(task)
-        return ans
+        return task
 
-    def run(self):
-        for _ in self:
-            pass
-
-    def is_finishable(self):
-        return self.all_deps.issubset(self.all_output)
+    def backlog(self):
+        """ Yield tasks sorted according to dependencies """
+        while self.doable_tasks:
+            yield self.next_task()
diff --git a/test/test_scheduler.py b/test/test_scheduler.py
index cca528b..4ac1475 100644
--- a/test/test_scheduler.py
+++ b/test/test_scheduler.py
@@ -3,18 +3,11 @@ from bopytex.scheduler import Scheduler
 import pytest
 
 
-def action_done(deps, args, output):
-    return f"{deps} - {args} - {output} - done"
-
-
-actions = {"DO": action_done}
-
-
 def test_schedule_append():
-    scheduler = Scheduler(actions)
+    scheduler = Scheduler()
     tasks = [
-        Task(action="DO", args={}, deps=["dep1", "dep2"], output="end1"),
-        Task(action="DO", args={}, deps=["dep1", "dep3"], output="end2"),
+        Task(action="FOO", args={}, deps=["dep1", "dep2"], output="end1"),
+        Task(action="FOO", args={}, deps=["dep1", "dep3"], output="end2"),
     ]
     scheduler.append(tasks)
     assert scheduler.tasks == tasks
@@ -22,104 +15,115 @@ def test_schedule_append():
     assert scheduler.all_output == {"end1", "end2"}
 
 
-def test_schedule_dispatch():
-    scheduler = Scheduler(actions)
-    task = Task(action="DO", args={}, deps=[], output="end")
-    result = scheduler.dispatch(task)
-    assert result == "[] - {} - end - done"
-
-
 def test_schedule_one_task():
-    scheduler = Scheduler(actions)
-    tasks = [Task(action="DO", args={}, deps=[], output="end")]
+    scheduler = Scheduler()
+    tasks = [Task(action="FOO", args={}, deps=[], output="end")]
     scheduler.append(tasks)
+
     assert scheduler.doable_tasks == tasks
-    result = scheduler.next()
-    assert result == "[] - {} - end - done"
+
+    result = scheduler.next_task()
+    assert result == tasks[0]
     assert scheduler.tasks == []
     assert scheduler.done == ["end"]
 
 
 def test_schedule_one_task_with_args():
-    scheduler = Scheduler(actions)
-    scheduler.append([Task(action="DO", args={"task": "one"}, deps=[], output="one")])
-    result = scheduler.next()
-    assert result == "[] - {'task': 'one'} - one - done"
+    scheduler = Scheduler()
+    tasks = [Task(action="FOO", args={"task": "one"}, deps=[], output="one")]
+    scheduler.append(tasks)
+
+    result = scheduler.next_task()
+
+    assert result == tasks[0]
     assert scheduler.tasks == []
     assert scheduler.done == ["one"]
 
 
 def test_schedule_multiple_tasks():
-    scheduler = Scheduler(actions)
-    t1 = Task(action="DO", args={"task": "one"}, deps=[], output="one")
-    t2 = Task(action="DO", args={"task": "two"}, deps=[], output="two")
-    t3 = Task(action="DO", args={"task": "three"}, deps=[], output="three")
+    scheduler = Scheduler()
+    t1 = Task(action="FOO", args={"task": "one"}, deps=[], output="one")
+    t2 = Task(action="FOO", args={"task": "two"}, deps=[], output="two")
+    t3 = Task(action="FOO", args={"task": "three"}, deps=[], output="three")
     scheduler.append([t1, t2, t3])
 
     assert scheduler.doable_tasks == [t1, t2, t3]
     assert scheduler.is_finishable()
 
-    result = scheduler.next()
-    assert result == "[] - {'task': 'one'} - one - done"
+    result = scheduler.next_task()
+    assert result == t1
     assert scheduler.tasks == [t2, t3]
     assert scheduler.done == ["one"]
 
-    result = scheduler.next()
-    assert result == "[] - {'task': 'two'} - two - done"
+    result = scheduler.next_task()
+    assert result == t2
     assert scheduler.tasks == [t3]
     assert scheduler.done == ["one", "two"]
 
-    result = scheduler.next()
-    assert result == "[] - {'task': 'three'} - three - done"
+    result = scheduler.next_task()
+    assert result == t3
     assert scheduler.tasks == []
     assert scheduler.done == ["one", "two", "three"]
 
 
 def test_schedule_multiple_tasks_with_dependencies():
-    scheduler = Scheduler(actions)
-    t1 = Task(action="DO", args={"task": "one"}, deps=["three"], output="one")
-    t2 = Task(action="DO", args={"task": "two"}, deps=["one"], output="two")
-    t3 = Task(action="DO", args={"task": "three"}, deps=[], output="three")
+    scheduler = Scheduler()
+    t1 = Task(action="FOO", args={"task": "one"}, deps=["three"], output="one")
+    t2 = Task(action="FOO", args={"task": "two"}, deps=["one"], output="two")
+    t3 = Task(action="FOO", args={"task": "three"}, deps=[], output="three")
     scheduler.append([t1, t2, t3])
 
     assert scheduler.doable_tasks == [t3]
     assert scheduler.is_finishable()
 
-    result = scheduler.next()
-    assert result == "[] - {'task': 'three'} - three - done"
+    result = scheduler.next_task()
+    assert result == t3
     assert scheduler.tasks == [t1, t2]
     assert scheduler.done == ["three"]
     assert scheduler.doable_tasks == [t1]
 
-    result = scheduler.next()
-    assert result == "['three'] - {'task': 'one'} - one - done"
+    result = scheduler.next_task()
+    assert result == t1
     assert scheduler.tasks == [t2]
     assert scheduler.done == ["three", "one"]
     assert scheduler.doable_tasks == [t2]
 
-    result = scheduler.next()
-    assert result == "['one'] - {'task': 'two'} - two - done"
+    result = scheduler.next_task()
+    assert result == t2
     assert scheduler.tasks == []
     assert scheduler.done == ["three", "one", "two"]
 
+def test_schedule_multiple_tasks_with_dependencies_loop():
+    scheduler = Scheduler()
+    t1 = Task(action="FOO", args={"task": "one"}, deps=["three"], output="one")
+    t2 = Task(action="FOO", args={"task": "two"}, deps=["one"], output="two")
+    t3 = Task(action="FOO", args={"task": "three"}, deps=[], output="three")
+    scheduler.append([t1, t2, t3])
+
+    ordered_tasks = []
+    for task in scheduler.backlog():
+        ordered_tasks.append(task)
+    assert ordered_tasks == [t3, t1, t2]
 
 def test_schedule_empty_task():
-    scheduler = Scheduler(actions)
+    scheduler = Scheduler()
     scheduler.append([])
     with pytest.raises(StopIteration):
-        scheduler.next()
+        scheduler.next_task()
 
 
 def test_schedule_multiple_tasks_with_undoable_dependencies():
-    scheduler = Scheduler(actions)
-    t1 = Task(action="DO", args={"task": "one"}, deps=["three"], output="one")
-    t2 = Task(action="DO", args={"task": "two"}, deps=[], output="two")
+    scheduler = Scheduler()
+    t1 = Task(action="FOO", args={"task": "one"}, deps=["three"], output="one")
+    t2 = Task(action="FOO", args={"task": "two"}, deps=[], output="two")
     scheduler.append([t1, t2])
 
     assert scheduler.doable_tasks == [t2]
     assert not scheduler.is_finishable()
 
-    scheduler.run()
+    for _ in scheduler.backlog():
+        pass
+
     assert scheduler.tasks == [t1]
     assert scheduler.done == ["two"]
     assert scheduler.doable_tasks == []