Abstract: This article describes a process by which internal evaluation was introduced in a residential treatment centre for adolescents in Quebec. The historical development, purpose, and philosophy of program evaluation at the centre are presented. A unique program for “multiple handicapped youth” collaboratively designed by the centre, a hospital, and a social service agency, as well as the methods of evaluation selected to examine the program’s efficiency and effectiveness, are described. Lastly, comments about the process of evaluation and some final results of the evaluation are reported.