Group work is not new, and you can see it in every classroom. However, productive group work is rare. When working in groups, students tend to rely on the person who seems most willing and able to the task at hand. Psychologists call this phenomenon social loafing. To increase the productivity of your groups, you need to be selective about the tasks you assign to them and the individual role that each group member plays. You should only ask groups to do tasks that all group members can do successfully. You should also ensure each group member personally responsible for one step in the task.