The jigsaw technique is a method of organizing classroom activity that makes students dependent on each other to succeed. It breaks classes into groups and breaks assignments into pieces that the group assembles to complete the (jigsaw) puzzle. It was designed by social psychologist Elliot Aronson to help weaken racial cliques in forcibly integrated schools - wikipedia 
# See also - Jigsaw (teaching technique) - Obstacles to PBL - Project-based learning - Criticism of PBL