The National Latino and Asian American Study (NLAAS) provides national information on the similarities and differences in mental illness and service use of Latinos and Asian Americans. The NLAAS is one of the most comprehensive studies of Latinos and Asian Americans ever conducted using up-to-date scientific strategies in the design, sampling procedures, psychiatric assessments, and analytic techniques. The final NLAAS sample consisted of 2,554 Latino respondents and 2,095 Asian American respondents.