John Cleese has a talk on being in an open mode mentally vs closed mode. Come up with ideas in as open a mode as possible. Then at a later time, get into a closed mode and reject bad ideas and work on and refine the good ones.

Authors of all types typically have editors. In Magic: the Gathering design, sets are initially created by a design team and handed off to a (usually completely separate) development team. Anyone have more examples?

dev vs validation team