Abstract
Publisher Summary Adaptive behavior scales play an important role in helping practitioners diagnose, plan supports, or determine an individual's level of independence. Research is being conducted to develop specific scales to examine the underlying constructs that these scales are designed to measure. The construct of adaptive behavior is fundamental to any definition of intellectual disability (ID). Current definitions of ID include adaptive behavior as a component, but place adaptive behavior at different levels of prominence. The most widely used adaptive behavior scales provide a unified composite score in addition to individual domain scores. There are a number of unique concerns regarding the psychometric properties of tests when applied to persons with ID. Scales in which ceiling scores are established rapidly underestimates an individual's abilities in that domain if the skills have developed in an atypical order. The scales identified most frequently are the Vineland Adaptive Behavior Scales (VABS), the Adaptive Behavior Scales (ABS), and the Scales of Independent Behavior (SIB)/ Inventory for Client and Agency Planning (ICAP).
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