Each subject have their own task lists, which are collaborative since each subject member can add and delegate tasks.
The default task list named To-do corresponds to all opened tasks for this Subject. Other useful team lists include the following.
Planned: A list of all tasks with a start date
Due dates: A list of all tasks with a due date
Assignees: Tasks grouped by assignees
Completed: Completed tasks ordered by completion date
All tasks: All of the subject's tasks
Canceled: A list of the canceled tasks on the subject
Unassigned: A list of tasks which are not currently assigned to a team member