As a lesson in low budget efficiency, screenwriters new to the scene may do well by renting "Return of the Secaucus Seven" which has a good story within an economic and workable low budget scenario even for the microbudgeted amongst us. Ross Jones' reference to Joseph Campbell is on the mark. The nature of drama has not really changed since the dawn of storytelling. "The Hero with a Thousand Faces" is a classic. But once you understand the mythic underpinnings of your story's hero, you still have to work like mad to keep your characters from being cinematic "sacks of potatoes." Writing an interesting character with meat in the role attracts better actors. I recall William Hurt recanted star level salary to do "Kiss of the Spider Woman" after bursting on the scene with "Altered States," "Body Heat," "The Big Chill," and others. Another rule of thumb: let it rest, and rewrite it, which is to say, finish a draft of your screenplay, take a break (maybe months), then re-read it critically, and fine tune (or make wholesale changes) with a rewrite. Repeat this often. Screenplays go through many drafts prior to being either submitted to agents or locked for independent production. (Well, at least screenplays not headed for the adult section.) Richard Brown