Aberrant Behavior Checklist
The Aberrant Behavior Checklist (ABC) is an informant rating instrument that was empirically derived by principal component analysis (Aman et al. 1985a). It contains 58 items that resolve onto five subscales. The subscales and the respective number of items are as follows: (a) Irritability (15 items), (b) Social Withdrawal (16 items), (c) Stereotypic Behavior (7 items), (d) Hyperactivity/Noncompliance (16 items), and (e) Inappropriate Speech (4 items). A total score for this instrument was not psychometrically derived, and is not valid. The ABC was designed to be completed by any adult who knows the individual well. This could be a parent, teacher, workshop supervisor, case worker, and possibly informants in other roles as well. Depending upon reading ability, completion time varies, but most raters can complete the ABC in 10–15 min the first time they fill it in....
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