The collaborative nature of PBL can be tricky for some students. You need to be able to work together to get the most out of a PBL, but what do you do if students need help learning to collaborate?
Design Challenges are a great way to have students work together. Tom Wujec put together resources for The Marshmallow Challenge.
The task is simple: in eighteen minutes, teams must build the tallest free-standing structure out of 20 sticks of spaghetti, one yard of tape, one yard of string, and one marshmallow. The marshmallow needs to be on top.