- ABBAS II - Adaptive Behavior Assessment System - (for both teacher/social workers and parents). The ABAS II test assesses adaptive behavior in three domains: conceptual, social, and practical functioning. Beside the domain targeting the social skills in the test, many of the subscales can be linked to social functioning in general and the test is sensitive to progression/maturation (Harrison et al, 2003). The ABAS II is completed by both parents and teacher/social worker.