The Clinical Assessment of Behavior (CAB) is designed to assess both adaptive and problematic behaviors of children and adolescents from age 2 to 18 years. It can be individually or group administered, measures behaviors in different contexts, and includes both parent and teacher forms. The test was developed to be consistent with current diagnostic criteria including the "Diagnostic and Statistical Manual of Mental Disorders-Fourth Edition-Text Revision" (DSM-IV-TR; American Psychiatric Association, 2001) and Individuals With Disabilities Education Act Amendments of 1997, as well as including current sociopolitical concerns such as school bullying. To increase utility, the authors focused on developing a "user-friendly," culturally sensitive, and concise measure that requires minimal reading ability. It is intended for use in clinical, educational, and research settings. Its clinical uses include assisting with assessment, diagnosis, screening, and treatment. Its educational use is unique in that it can help to identify educationally relevant abilities such as gifted and talented. In research, it can be used to substantiate diagnostic information, to predict outcomes, to evaluate programs, and to conduct intervention follow-up. This article discusses the technical adequacy of the CAB.