An evaluation of functional variables affecting severe problem behaviors in adults with mental retardation by using the Questions about Behavioral Function Scale (QABF).

We examined the functions of five severe problem behaviors in a sample of 417 institutionalized persons with mental retardation by using the Questions About Behavior Function Scale. The behaviors we examined included self-injurious behavior, aggression, stereotypies, pica, and rumination. The most common function for all behaviors except aggression was nonsocial. Aggression, however, was maintained by external environmental contingencies. Particular items of the Questions About Behavior Function Scale were identified as more frequently occurring and critical in ascertaining behavioral function. Implications of these results for developing more effective treatment plans are discussed.