Screenwriting 101 -- Walter Hill

"When I'm working alone, the old hard way. Longhand. Fountain pen. Legal pad. Thesaurus at my side. This last item, I'm not ashamed to say, is quite helpful -- when you write screenplays, you don't have a lot of room, and the stage directions can become onerously repetitive if you don't work at fresh descriptions. Try to show a reader a new way to see it. Unless, of course, you are using repetition as a rhythm device in creating mood -- which I guess is a perfect illustration of one of the things I like best about screenwriting: whatever is true, the opposite can also be true. Both at the technical level and at a much larger one -- I think it's best approached as an enigmatic way to make a living."

-- Walter Hill (The Warriors, 48 Hrs., Aliens)