Each individual assignment of duties is accompanied by the designation of a supervisor. This supervisor (a member of the staff or faculty) tells each assistant assigned to him or her what the assistant is supposed to do, and when to do it. It is the mutual responsibility of supervisor and assistant to reach explicit understanding on the assistant's responsibilities, including such things as scheduling office hours, proctoring exams, and grading papers.
The supervisor is expected to make sure that assignments are carried out adequately. Especially in the case of academic assignments, the supervisor is expected, in consultation with the Director of Undergraduate Studies, to take appropriate steps when necessary to improve the teaching done by each assistant assigned to him or her. At term's end, each supervisor will be asked to evaluate the performance of the assistants assigned to him or her.