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Professionals who diagnose ADHD must follow the criteria set forth by the Diagnostic and Statistical Manual of Mental Disorders. They not only base their evaluation on characteristic behaviors, but also on a series of medical, behavioral, and educational assessments. The National Institute of Mental Health·s (NIMH) Multimodal Treatment Study of Children with and without Attention-Deficit/Hyperactivity Disorder was a multisite study designed to evaluate the primary treatments for ADHD. The NIMH database is composed of a large number of assessments that were given to children/adolescents, parents, and teachers. The Conners, SNAP-IV, and Harter assessments were the only measures completed by all three groups. The purpose of this study was to determine if the responses to the three assessments from adolescents, parents, and teachers resulted in four behavioral constructs: Academic Behavior, External Behavior, Internal Behavior, and Social Behavior. The results of a factor analysis identified Social Behavior in all assessments, Academic Behavior in all assessments except for the Harter teacher assessment, Internal Behavior as evident only in the adolescent assessment for Conners and SNAP-IV, and External Behavior as evident in all parent assessments as well as the adolescent assessments for Conners and SNAP-IV. Th