Group Projects and Weakest Links

I've learned something this school semester about working as a group.
As the chain is only as strong as its weakest link, so a group is only as smart as its strongest member.

No matter how poor his/her idea is, the loudest, strongest-willed person in the work group will get his/her way over any smarter idea.  Anyone who knows better but is too timid to speak up will not be able to propel your group project in a positive direction.

It's not enough to surround yourself with smart people.
The smart people need to be the ones in charge.