Jigsaw

Jigsaw, as described here, is a student participation strategy.

The teacher creates groups of four to five students. Each student is assigned some unique material to learn and then teach to his or her group members. To help in the learning, students from different groups who are focusing on the same material get together to decide what is important and how to teach it. After practice in these "expert groups," the original groups re-form and students teach each other.

this activity provides interdependency and accountability within a small group.