
Writing documentation for stuff, at least in my head (regardless of what the stuff is) also involves checking to make sure that what is supposed to be happening does. (I do documentation and testing for bugs pretty much simultaneously. Always have. It's a large part of why I'm good at documenting things that I understand well enough to test them or use them. I have to write things down to remember them _anyway_!)
Oddly, this appears to relate _strongly_ to the process I use to figure out the things in my head.
1) write something down
2) read it, see if it's accurate, clear, and covers everything
3) if missing any of the above, go back to one and modify the original writings. Alternately, if I can't figure out where things aren't quite right, have someone else take a look. When they find something or question something, go back to one and modify.
It's not that I do drafts, because I don't. Drafts always killed me in school, because if I saw things as not being accurate, I would want to fix them _then_. (well, also because drafts were writing by hand, which is hell for me) It's more like... writing an outline of what I want by putting basic concepts on paper, with little to no organization, then filling them out and moving things around as necessary.
Because, for me, organizing is _last_, and happens when I think a piece of what I'm writing has enough words to be clear. So outlines are... worthless to me. Entirely. Drafts almost as much so, since at least drafts have the useful aspect of encouraging me to come back to an idea after a bit of time has passed, and see if it still makes sense.
I do often wonder how entertaining it might be to watch the process I use to write things, if they are things which require a lot of effort to write (usually, these things are heralded by a total inability to interact with people until I've at least written down the initial basic concepts, although I tend to prefer to at least fill some of the words around them in, as well.).
Organizing is very much a learned, not automatic, thing for me. On the plus side, it appears to be tied thoroughly into my mild OCD.