Project task dependencies A task dependency is created when one task is prevented from starting or finishing based on the state of another task. The Project Management application supports several types of dependencies. Task time constraintsThe Project Task form includes a Time Constraint field, which can be either of these values: Start ASAP or Start on specific date. If a task is set to Start ASAP: The task appears on the Gantt chart as starting when the dependency allows it. However, a task can start on a later date when a lag value is set for the relationship. If a task is set to Start on Specific Date: The task appears on the Gantt chart as starting on the specified date.Note: The project property Retain start on constraint on tasks after adding relations controls the start on time constraint of a successor task. The property is set to False by default. If the property is set to False, a successor task with Start on Specific Date time constraint is set to Start ASAP and the start date is set appropriately. If the property is set to True, the start date of a successor task with Start on Specific Date time constraint is not impacted even after you put the task in a relation to another task. The Lag or Lead value in the relationship also has no impact. Create a dependency from the planning consoleYou can create a dependency between two tasks on the planning console.Modify a project task dependencyYou can modify a dependency when editing the tasks that are linked in the dependency, the dependency type, or the lag time.Remove a dependencyUse the planning console to remove a dependency that is no longer necessary.