Informant scoring errors on the Adaptive Behavior Scale.

Adaptive Behavior Scale Booklets (N = 284) completed by institutional direct-care personnel were examined for scoring errors. An average of over 2 errors per booklet was calculated, with the most prevalent errors involving simple addition or failure to subtract when directed. It was suggested that the format of the Adaptive Behavior Scale fosters errors of underestimation. Possible solutions to this problem were discussed.