Students could identify the individual components of a project, in essence prompting them to really break the task down into smaller objectives. Each student would have some autonomy over their tasks. It would clearly delineate who was responsible for which steps. If needed, for the first project, the teacher could role model how to list the steps and allow the groups to choose roles, and thereafter, the groups could break it down themselves.
I think this would be a valuable tool to promote discussions and cooperation within a group. Check it out and let me know what you think!
Sample Project Task