Adaptive Behavior Assessment System-II summarizes information on adaptive behavior and skills as well as general issues in adaptive behavior assessment with the goal of promoting sound assessment practice during uses, interpretations, and applications of the Adaptive Behavior Assessment System-II. Adaptive behavior and skills refer to personal qualities associated with the ability to meet one’s personal needs such as communication, self-care, socialization, etc. and those of others. Data from measures of adaptive behavior have been used most commonly in assessment and intervention services for persons with mental retardation. However, the display of adaptive behaviors and skills is relevant to all persons. The Adaptive Behavior Assessment System-II (ABAS-II) provides a comprehensive, norm-referenced assessment of the adaptive behavior and skills of individuals from birth through age 89. The comprehensive natures of the ABAS-II, ease in administration and scoring, and wide age range have resulted in its widespread use for a large number of assessment purposes. The book provides practical information and thus serves as a valuable resource for those who use the ABAS-II.