c2263325_culty_Institute___What_is_PBL___WHY_
[WHAT:] Student-centered & Experiential [HOW?] Select authentic assignments from the discipline, preferably those that would be relevant and meaningful to student interests. Students are also responsible for locating and evaluating various resources in the field. [WHY?] 
Relevance is one of the primary student motivators to be a more self-directed learner
Problem-Based Learning Faculty Institute - What is PBL?
WHY?