This study investigates the effectiveness of response preclusion on stereotypic behavior (climbing and licking) and on play for a child with autism. Data were collected on stereotypic responses, play behavior, and the types of play materials the participant contacted. Implementation of response preclusion was followed by both a decrease in stereotypic behavior as well as an increase in play behavior. Play behavior did not return to baseline levels of responding during reversals to baseline, and stereotypic behavior decreased across reversals. These results suggest the current antecedent manipulation not only reduces stereotypic behavior, but also can establish an environment that is more conducive to learning new, desired behavior.