The use of a computer-based system of individualized course evaluations, Instructor-Designed Questionnaires (IDQs), to collect student reactions to classes at the University of Michigan is discussed. Originally designed to provide feedback to university teachers alone, the system is now used extensively by teachers to gather information for themselves as well as for departmental committees and student groups. The system is also used on a more limited basis in program evaluation. Recently, IDQs were used to collect student reactions to both foreign-educated and American teaching assistants (TAs) at the university. Initial ratings of both groups of teaching assistants were far below university norms, but ratings improved after one semester of teaching. It is suggested that a TA's first semester ratings are open to misinterpretation and that verbal facility is very important to teaching. IDQs (and similar course evaluation systems) were found to provide useful information for teachers wishing to improve their teaching, but the proportion of teachers who will use this type of system voluntarily is probably small. In addition to providing useful data for administrators and committees deliberating about personnel, these systems can also provide useful data for students choosing classes. (SW)