Graduate student teaching assistants may be assigned a variety of duties under the supervision of one or more faculty members. These assignments may vary from semester to semester as the needs of the teaching program vary. They may include serving as laboratory instructor, conducting recitation and problem-help sessions, development of new course material, grading examination papers from lecture courses, and tutoring individual students. Usually, these work assignments will be made at the beginning of each semester, but unusual situations may necessitate changing an assignment during a semester.