Physician employment needs in Ohio were reviewed, with attention to supply and demand, medical school enrollments, and attendant costs. The major focus was to develop an information system and methodology that would support planning for medical school education. Specific concerns were: (1) whether physician production in Ohio's medical schools and residency programs are meeting the need for physicians in the State; (2) whether the decline in the 18- to 22-year-old population will affect the number of qualified in-state applicants; (3) whether there is evidence that a continued large output of physicians will resolve the state's maldistribution of primary care physicians, and (4) whether the overproduction of physicians increases or decreases health care cost. Data were obtained on the number of licensed physicians living in Ohio, arrayed by age, practice specialty, county, and for selected counties, by zip codes. Primary care physician-to-population ratios were used to assess the presence of underserved counties. The numbers of physicians needed in Ohio by 1990 and 2000 were projected. To assess current and future physician supply, calculations were made of medical school enrollments, residencies, and in-migration of foreign and out-of-state physicians. The cost of medical education and the cost of physician oversupply were also assessed. (SW)