c2263325_culty_Institute___What_is_PBL___WHY_
[WHAT:] Collaborative & Interdependent [HOW?] Have students work in small groups in order to address the presented case [WHY?] 
By collaborating, students see other kinds of problem solving strategies used, they discuss the case using their collective information, and they need to take responsibility for their own learning, as well as their classmates.
Problem-Based Learning Faculty Institute - What is PBL?
WHY?