One thing I'm still trying to wrap my brain around viz-a-viz GTD is how granular a next action is, in terms of a project. Say, for example, I have a paper to write for an English class (which I do). I figure my NAs are:

1. Skim book for passage to analyze
2. Re-read book, and take notes
3. Skim previous class readings to choose comparison piece
4. Re-read chosen piece
5. Write first draft
6. Revise first draft
7. Write final paper

It's 5, 6, and 7 that have me curious as to whether those are really NAs, or if they can be made more granular and subdivided. There's subtasks to the actual writing, I suppose, but do I really need "Write thesis," "Write supporting argument 1," etc.?