29EUROPEAN JOURNAL OF BEHAVIOR ANALYSIS

Research in behavior analysis has had a significant impact on the treatment of severe behavior disorders (e.g., self-injurious behavior or SIB, aggression, property destruction, etc.) exhibited by individuals with developmental dis-abilities. Not surprisingly, much of this research is based on interventions that directly weaken response-reinforcer relationships and/or establish alternative responses that replace the function of the problem behavior (Kahng, Iwata, & Lewin, 2002). One example of this type of intervention is differential reinforcement of other behavior (DRO), in which reinforcement is delivered for the absence of responding (Catania, 1998). DRO, along with differential reinforcement o