The use of operant conditioning techniques in a classroom for educationally handicapped children was studied to determine if it would result in a reduction of maladaptive behavior. The subjects consisted of an experimental and a control group of elementary school children, with an IQ range in the experimental class of 88 to 119. The experimental period required 22 consecutive school days. During the experimental hour, the observer watched the class from one corner of the room where he operated a stop clock. If no unapproved behavior occurred during a specific time interval while the clock was running, the class was given one penny. If any maladaptive behavior did occur, the clock was stopped, reset and started again when all behavior was acceptable. The students were allowed to buy candy, put their money in a bank, or take it home with them. Results indicated that there was a significant reduction in the occurrence of maladaptive behavior in the experimental classroom, that background noise was reduced significantly, that there was a significant decrease in teacher reinforcement of maladaptive behavior, that there was a significant reduction of hyperactive and maladaptive behavior in the total school setting, and that similar findings did not obtain in the control class. School work of all experimental children showed substantial improvement. (Author/CB)