The Cunctator wrote:
Groupthink is when everyone involved assumes that someone else has done XYZ crucial piece of error-checking.
That's very close to my understanding of the term. As I mentioned elsewhere, I'm involved in a startup. One of the most frequently mentioned fears is "groupthink", by which we mean mistaking being in accord for being right. As Guy says, though, I usually hear it as a pejorative.
William