“…Some programs have emphasized only positive consequences for good notes (Karraker, 1972;Lahey et al, 1977;Budd & Leibowitz, Note 1), while others have encouraged differential reinforcement (Ayllon, Garber, & Pisor, 1975;McKenzie et al, 1968;Stedman, 1976;Todd et al, 1976). The rewards and sanctions to be used have been spelled out very explicitly (Edlund, 1969;McKenzie et al, 1968;Schumaker et al, in press), and have also been left largely up to the parents (Ayllon et al, 1975;Karraker, 1972).…”