If at the end of each module a tutor group was awarded a prize for a combination of grades, contribution and participation might it trigger a little healthy competitiveness and greater internal support. Watching a video
from Carnegie Mellon I was taken by the stats that were produced after every module in which peer review scored fellow students on how much they had participated in the team. The professor praised and rewarded those who collaborated the most and grew concerned at those who did not. This, for him, was in part, a mission to prepare these students (on a Masters programme on Virtual Worlds) for the world of work.