The use of videotape replay was evaluated as a new therapeutic and educational technique in the treatment of mental retardation. It was hypothesized that the retardate would improve his behavior after seeing himself interacting with others on the television screen. The behavior of the control and experimental groups was rated by four therapists and four assistants on a fourteen point behavior rating scale three times during the study: before and after a three month baseline period and after the three month experimental period. Behavior modification techniques were used in both groups to aid motivation. The results showed no significant difference between the control and experimental groups. Some improvement in control of nervous habits, stimulation of performing behavior, and improvement in body image discrimination was noted in the experimental groups. (JY)