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If we discard some of the assumptions upon which curatively oriented medical care is based, we can design models to deliver more effective services for those with chronic diseases. Assumptions to be discarded are--that disease processes can be cured through the delivery of a "magic bullet" rather than controlled through continuous surveillance, -that the physician must be an active decision maker and thus act as gatekeeper and monitor for all disease victims, and -that care for a family of consumers must be provided together. Models for the delivery of services can then be designed to provide continuity of care for those with a specific chronic disease, and paraprofessionals can be used as gatekeepers and monitors, in combination with physicians, rather than physicians alone, to give services. Models can be targeted to reach specific high-risk groups within the population at the workplace, the school, unemployment office, or wherever groups routinely congregate for purposes other than health care. Building targeted models requires extensive knowledge of the specific geographic area and its population as well as knowledge of the natural history of the disease and its treatment. For hypertension programs, goals can be set in terms of numbers of persons whose disease is controlled and the number of new programs initiated as the result of the control efforts.