Assessment is one of the aspects of PBL we hear the most concerns about. Teachers, administrators, and sometimes parents ask questions such as, Is everything assessed in the culminating presentation or final product in a project? How do we know what individual students have learned if everything’s done as a team? How do we assess success skills like critical thinking, problem solving, and collaboration? How do we reconcile assessment in PBL with grading and other traditional practices and measures of achievement?