One of the most common features of any PBL project is group work. Even if the product is individual, there should always be some form of group work within the project to give students the ability to receive critique and revision, to share resources and think deeper about what they’re learning, and to practice and develop the 21st century skill of collaboration. Not only should they be able to work as a group during the project, they should also find time to work as a group but independent and absent any direct instruction by the teacher. This can be a daunting challenge for even experienced classroom practitioners as they may not know how to scaffold a gradual release for their students or may have concerns about specific students in their class being able to work without derailing an entire group.