“…Contingent removal of reinforcement is regarded as a preferred punishment procedure by many clinicians because a physically painful stimulus is not required (Johnston, 1972) and the techniques are readily taught to paraprofessionals (Davison, 1964(Davison, , 1965Laws, Brown, Epstein, & Hocking, 1971) and parents (Barrett, 1969;Nordquist & Wahler, 1973;Wahler, 1969). As a result of its ease of administration and low aversiveness, contingent removal of reinforcement alone or in combination with DRO has been applied to a wide range of problem behaviors including self-stimulation (Greene, Hoats, & Hornick, 1970;Fendergrass, 1972), SIB (Adams, Klinge, & Keiser, 1973;Anderson, Herrman, Alpert, & Dancis, 1975;Brawley et al, 1969, Hamilton, Stephens, & Allen, 1967Harmatz & Rasmussen, 1969;Husted, Hall, & Agin, 1971; J. J. Myers & Deibert, 1971;Wolf, Risley," Johnston, Harris, & Allen, 1967), and aggressive behaviors (Bostow & Bailey, 1969;Drabman & Spitalnik, 1973;Hawkins, Peterson, Schweid, & Bijou, 1966;Husted et al, 1971;Sachs, 1973;Vukelich & Hake, 1971).…”