CompuServe Messages

Martin, Through my experience in the building and remodeling business I've had occasion to do a lot of subcontracting and bidding. So I'm curious how the bidding process would work in something so subjective as computer art (animation). Does the process go something like we work for so much an hour (minutes, seconds, frames), or do they have a creative idea and you would have to bid on it, sort of like name that tune? Forgive my ignorance. I very much appreciate your help. Roger D.