They are told less about how to do the experiments and are expected to make their own decisions. Such an approach means that students participate in fewer experiments and that the emphasis is on the depth of the problem solving rather than on the breadth of analytical techniques. PBL also sparks concerns about how faculty are to assign individual grades. Those who are concerned about scoring student achievement might look to industry for guidance. On the job, people's competency and contributions are evaluated in any number of ways, including portfolios, peer reviews, self-assessments, and final product.
Grades can include evaluation of individual contribution as well as the results of a team effort.