First, please remember that your teaching assistants are also students and like you they often have many assignments to complete or exams to study for at the same time. If a problem arises with your TA in a recitation or in office hours, then you should first speak directly with the TA. For example, if you feel that the TA ignored you or your question in a recitation, then simply approach the TA after class and tell him or her. Most times the TA will not even realize that he or she did anything wrong. If after speaking with the TA you are not satisfied with his or her response, then you should mention this to the professor who will speak with the TA directly. If you have a problem with the way that an assignment was graded or with the (un)timely fashion that a graded assignment was returned, then you should again first speak with the TA. In many of the classes there are multiple TAs, which means that each assistant only grades some or parts of each assignment. Your TA should be able to direct you to the appropriate person (including the professor) who will be able to answer your grading questions. If the assignments are handed back consistently late or if solution sets are incorrect (or nonexistent), then you should speak with the professor so that he or she can correct the problem.