This paper describes a system of ongoing student evaluation of a behavioral sciences course for medical students. Student opinion about all aspects of the course is tapped, using a variety of methods including formal and informal discussion between staff and students; and written evaluations of lectures, tutorials, textbooks, assignments, and methods of assessing students' performance. The evolution of the evaluation programme into its present form is described, together with the way in which student evaluations are used, and the limitations of these methods of evaluating a course.