The effectiveness of the program was evaluated by annual population survey samples of cross-sections or cohorts and by morbidity and mortality surveillance. The annual risk factor survey measured community and individual change in risk factors and related behaviors in 25-74 year old persons living in each of the six sites. Annual surveys included between 300-500 persons and were population-based, random, neighborhood cluster samples of each town. Selected households were invited to participate. A home interview was conducted to collect data on health beliefs, attitudes, and behaviors, medical history, health message exposure, and demographic characterization. After the home interview, participants had additional risk factor measurements at a survey center. Data were collected on height, weight, blood pressure, serum total and HDL cholesterol, and serum thiocyanate. In each community, a 50 percent sample of subjects was assessed for dietary habits and the other 50 percent for physical activity.