So lets say I’ll attack three or four scenes, and what I’ll do is I’ll write a draft and hand it in to Lee the director and he’ll go, ‘eh, X, Y and Z.’ So then I go back and I’ll go through that very small two-person feedback loop for five or six passes, basically, until Lee finally goes, ‘OK, I think that’s it.’

Michael Arndt Digs Into Toy Story 3 and the Genius of the Pixar System – Thompson on Hollywood