These parameters describe the aims and approach to diagnosis, treatment, and monitoring of children and adolescents with language and learning disorders (LLDs). LLDs are amon the most common developmental disorders the clinician is likely to encounter. About 50% of children with an LLD also have a comorbid Axis I psychiatric disorder. The diagnosis of an LLD requires a discrepancy, based on age and intelligence, between potential and achievement. The clinician collaborates with parents and school personnel to clarify the diagnosis, implement appropriate treatment and remediation, and monitor progress. The clinician is instrumental in identifying and treating comorbid conditions, including determining the appropriateness of medication. Long-term prognosis depends on the type and severity of the LLD, the availability of remediation, and the presence of a supportive family and school environment. J. Am. Acad. Child Adolesc. Psychiatry, 1998, 37(10 Supplement):46S–62S.