Posted by Claudio:
Well, I don't know what those initials stand for. For me, task dependency is just this: Task B cannot (or should not) be started until Task A is completed. This means that the project has some structure, direction, and flow.
On my list of active tasks, I want to see those things that I need to do now, not the things that I need to do after I complete the things that I need to do.
Claudio, I agree, this would be a great addition to avoid cluttering task lists.