APA Dictionary of Psychology

a standardized assessment measuring the conceptual, social, and practical skills needed for daily functioning. The presence of significant limitations in these domains is necessary to establish a diagnosis of intellectual developmental disorder. This scale is used with individuals ages 4 to 21 years and includes 500 items that the administrator can draw from in an hour-long interview with an individual’s parents, teachers, or case manager. [developed by the American Association on Intellectual and Developmental Disabilities]