Measuring severity of behavior: a revision of Part II of the Adaptive Behavior Scale.

This study was designed to: (a) assess the degree to which rehabilitation staff rate the severity of maladaptive behaviors on Part II of the AAMD Adaptive Behavior Scale (ABS) and, on the basis of the obtained rating, (b) develop a socially validated revision of the scoring system to allow more accurate classification of mentally retarded individuals as having mild, moderate, or severe behavior problems. On the basis of the modal ratings obtained from various service agencies for "occasionally" and "frequently" on Part II of the ABS, we constructed a revised scoring system. Preliminary use of the scoring system suggests satisfactory agreement between "severity profile" scores and subjective ratings of individuals classified by service agencies as demonstrating mild, moderate, or severe behavior problems.