[admax88q]

In University for me at least, a lot of those collaborative projects allowed the students to distribute their grade amongst participants.

In my experience at least the weaker contributors to the groups success, even those that just coasted, were still very honest when asked to assess their contribution and the contribution of others.

[curried_haskell]

In my university we often had group projects and at the end of the project you scored your team members. If the entire team scored one member highly or poorly, their grade could be weighted higher or lower.