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Abstract
A mentally retarded, behaviorally disturbed child who exhibited several inappropriate motor responses was treated with a differential reinforcement program in two special classroom settings. The program consisted of reinforcing the child with tokens for the absence of inappropriate responded during prescribed intervals measured by a mechanical timerr. Tokens were exchanged for access to a play area. Following stable suppression of target responses, procedures to program maintenance of treatment effects were implemented, consisting of: (1) gradually eliminating token reinforcers, (2) removing stimulus control features of the timer, and (3) increasing the intervals of reinforcement. Target responses failed to increase during the application of maintenance-facilitating procedures, and they remained at low levels at a 2-month follow-up with no treatment contingencies in effect.