InrodwtionCardiovascular disease remains a major cause of premature mortality and morbidity in most industrialized countries.1 A major aim of cardiovascular disease prevention has been to modify those factors, such as cigarette smoking, serum cholesterol, elevated blood pressure, physical inactivity, and overweight, that are associated with an increased risk of developing cardiovascular disease.2,3It has been argued that work-site health promotion is an important component of a communitywide approach to the prevention of cardiovascular disease.4'5Because such a large proportion of the community is employed and individuals spend over a third of their waking hours at work,5 the potential public health benefits of work-site health promotion are far reaching. However, to make a significant public health impact, it is important to identify those interventions that are most effective in achieving health behavior change at the work site. There are a number of arguments in favor of multiple risk factor approaches,9 but mostwork-site intervention trials have addressed single risk factors, such as smoking or hypertension. To date, only two large work-site multiple risk factor interventions have been evaluated in a randomized controlled design.10,11 Both evaluated the effectiveness of brief counseling and follow-up contact with a health professional. Only the World Health Organization trial"i demonstrated a significant effect of the intervention on risk factor change.We conducted an efficacy trial offour work site-based cardiovascular disease risk factor interventions: health risk assessment, risk factor education, behavioral counseling, and behavioral counseling plus incentives. Work sites were randomly allocated to the intervention conditions, and biochemical and physical measures were used to validate self-reported behavioral changes. It was predicted that the behavioral counseling interventions would produce greater changes in cardiovascular disease risk factors than would the health risk assessment and the risk factor education interventions.