Team-taught courses may create challenges for coherence and consistency, as well as confusion about evaluation. For example, if three instructors collaborate on the teaching of a course, it may be difficult to sort out which student comments and assessments correspond with which instructor. In addition, if an instructor is in charge of a large class that includes laboratory sections, teaching assistants may be the ones supervising those labs. A distinction should be made in terms of evaluation of the instructor and evaluation of the teaching assistants.