When have you said too much?

Kyra writes her Notes from the Cube . . .

This is the question I have about the development process: when have you said enough?

At what point, in developing plans, or brainstorming, or conducting a review meeting - at what point has everything relevant been said? When are we not only repeating ourselves but we've started going in circles, eating our own tail? Has "constructive" criticism become destructive - making suggestions just to hear our own voices? Changing things just because we can - or we're afraid to commit?