Managing tasks is very personal. Therefore Endeavour only ships with a default Workflow that can be altered to the needs of the user.
Tasks follow a lifecycle that consists of 3 phases:
Capture
Processing
Execution
Each phase changes the state of the task, starting from the uncaptured state, leading up to the task completion.
Capturing a task is the act of storing the task in a permanent storage - your hard drive.
Captured tasks go to the inbox, which is the list of unprocessed tasks.
Processing a task consists of moving it to an appropriate task list, or doing it right away if it's a trivial task, or even throwing it in the wastebasket if you don't plan on doing it.
Optionally, adding more description, setting an end date, and marking it as important are done in this step.
Executing a task is what leads the task to its conclusion.