To achieve adequate representation of the major psychiatric disorders and sufficient normal controls, we propose recruiting 230 children and adolescents (ages 6 to 17 years 11 months), comprised of 200 subjects identified as having one or more psychiatric disorders and 30 normal controls in the community. These subjects will be from diverse socioeconomic, racial and ethnic backgrounds. We will assess the inter-rater and test-retest reliability of the MINI-KID and examine its validity with the "gold-standard" diagnostic interview for children and adolescents as well as expert opinion.