“…The utilization of peer groups has aided in modifying the behavior of a hyperactive child (Patterson, 1965;Patterson, Jones, Whittier, and Wright, 1965), in increasing the popularity of children (Alden, Pettigrew, and Skiba, 1970), in modifying off-task behavior (Ascare and Axelrod, 1973;Coleman, 1970;Feldman, 1973;Greenberg and O'Donnell, 1972;Kubany, Weiss, and Sloggett, 1971;Wolf, Hanley, King, Lachowicz, and Giles, 1970), in accelerating academic progress (Cocalis, 1972;Evans and Oswalt, 1967), and in maintaining appropriate social and academic behavior (Walker and Buckley, 1972) The independent group-oriented contingency system has been extensively applied in special-education classrooms and less extensively in regular public school classrooms, using at least three types of reinforcement procedures. For example, based on Premack's principle of reinforcement, the arrangement of free-time or special activities contingent upon the individual behaviors of all students in a classroom has been reported to increase desirable classroom behavior (Homme, deBaca, Devine, Steinhorst, and Rickert, 1963;Osborne, 1969;Wasik, 1970) and to improve academic performance (Hopkins, Schutte, and Garton, 1971;Lovitt, Guppy, and Blattner, 1969).…”