“…Behavior analysts have also succeeded in 50 PHILIP W. DRASH and ROGER M. TUDOR producing programs for the development of functional speech and language in developmentally delayed children. Establishing a functional language repertoire is a major objective of many of these programs (Bricker, 1980(Bricker, , 1983Bricker & Bricker, 1974;Cushing, Adams, & Rincover, 1983;Drash & Leibowitz, 1973;,1990Guess, Sailor, & Baer, 1976;Kent, 1974;Lovaas, 1966Lovaas, , 1977Lovaas, , 1980Lovaas, , 1981Lovaas, , 1987MacDonald & Horstmeier, 1978;Rogers-Warren & Warren, 1981;Shiefelbusch, 1978;Shiefelbusch & Bricker, 1981;Warren & Rogers-Warren, 1985).…”