No method is in general usage and of demonstrated effectiveness in eliminating the self-stimulatory behaviors of retardates and autistics. An Overcorrection rationale was used to develop such a method. The Overcorrection procedures consisted of a period of practice in the correct mode of the behavior contingent upon self-stimulatory behavior. The procedures were applied in a behavioral day-care program to three retarded children and one autistic child who exhibited object-mouthing, hand-mouthing, head-weaving and hand-clapping. For some behaviors, comparisons were made between the Overcorrection procedure and several alternative procedures, such as physical punishment by a slap, reinforcement for nonself-stimulatory behavior, a distasteful solution painted on the hand of a hand-mouther, and free reinforcement. The Overcorrection procedures eliminated the self-stimulatory behaviors of all four children in tutorial sessions and during the entire school day and were more effective than the alternative procedures in eliminating self-stimulation. The Overcorrection procedures appear to be rapid, enduring, and effective methods of eliminating self-stimulatory behavior.