“…Failure to identify the maintaining variable(s) of an individual's maladaptive behavior, thus limiting the extinction component of the DRO, is one difficulty. Previous research (e.g., Lovaas & Simmons, 1969;Rose, Sloop, & Baker, 1980) has indicated that one way to reduce the frequency of behavior is to discontinue its reinforcing consequences, but in order to withhold delivery of these reinforcers, they must first be known.…”