Readers (grading assistants) grade papers, exams, and other course work; they do not instruct students. They are paid on an hourly basis and do not receive fringe benefits. Readers do not ordinarily attend class, although in exceptional circumstances the supervising professor may request additional funds to allow the reader to audit. All graduate students are eligible, and the number of positions depends upon the number of professors who apply to the College of Letters and Science for funds; classes must have 40 students enrolled before the professor may apply. The departmental secretary posts the available positions; individual students should contact the individual professors, who may hire whom they wish.