Extinction of operant behavior, which involves terminating the reinforcement contingency that maintains a response, is important to the development, generalization, and reduction of behavior in clinical settings. We review basic and applied research findings on variables that influence the direct and indirect effects of extinction and discuss the potential value of a general technology for the use of extinction. We suggest that current research findings are not sufficient for the development of a comprehensive, applied technology of extinction and provide extensive guidelines for further studies on factors that may affect the course of extinction in clinical settings.DESCRIPTORS: extinction, behavior disorders, reinforcementExtinction of operant behavior involves terminating the reinforcement contingency that maintains a response, which results in a reduction in the behavior's occurrence over time. 1 Results of basic research (e.g., Ferster & Skinner, 1957;Skinner, 1938) have revealed much about its direct and indirect effects, including a number of variables that influence the general course of responding during extinction. These findings have important implications for the use of extinction in applied settings, in which behavior is ofWe thank Marc Branch, Timothy Hackenberg, Cecil Mercer, and Betty Capaldi for their helpful comments on an earlier draft of this manuscript.Reprints may be obtained from