Ten experimental and 10 control subjects in elementary special education were exposed to a semester of contingency management procedures for up to 6 1/2 hours per day. The experimental group was taught by teachers who were exceptionally well trained and qualified behavior analysts, while the control group was instructed by teachers with varying degrees of expertise in behavioral techniques. Both groups were given the Bender Gestalt as a pretest and posttest to determine the effect of such treatment on the diagnostic indicators of "acting out" tendencies. Furthermore, the rate of actual "acting out" was measured for all subjects by counting the number of verbal corrections resulting in placement in time out and/ or warning of forthcoming time out during 20 class days of baseline and the last 20 days of treatment.