PBL can be many things to many students. That is the magic of it!
While one student interviews a holistic physician and creates health plans for her clients, another is rebuilding a car using his own money and skills. While one is teaching third graders that science is cool through an after-school club, another is teaching kindergarteners hand-washing skills to curb the spread of influenza and other diseases. One partnership worked together to show teens that they matter in government through getting involved in local city council meetings and tweeting.
So many great experiences have been had by students through PBL!
Blevins' PBL Requirements