Make cooperative projects more fun and run more smoothly with roles. Avoid "hogs" and "logs" during open-ended team discussions. Develop students' teamwork skills and repertoire of social competencies. This SmartCard presents the 12 most essential cooperative roles, and answers critical questions relating to cooperative roles: What is a cooperative role? When do I use roles? How do I assign roles? How do students learn their roles? Minimise management problems and maximise students' performance with cooperative learning roles.