The overall goal of the Epidemiology and Intervention CORE is to make high quality services for epidemiologic and behavioral intervention studies available to Minnesota Obesity Center (MNOC) investigators. These include population selection, recruitment, and survey; data base management; nutrition assessment; and intervention development for outpatient and community studies. The services provided through this CORE are organized in four sections: 1. A data services section provides expertise in population selection, survey, study participant recruitment and follow-up, data entry, data base management and statistical support. 2. The nutrition assessment section provides expertise in dietary assessment methods, including instrument design, data collection, and nutrient analyses. 3. The intervention section provides guidance in the development of diet and exercise interventions for outpatient populations in clinic and community settings. 4. The health care delivery section provides access to members, clinics, and health databases of a managed care organization that delivers a wide spectrum of medical services to a member population of approximately 800,000.