To determine the characteristics of training in ambulatory internal medicine, all internal medicine residency programs in the United States were surveyed in 1981-82. Thirty-eight percent of 477 hospitals responded. Quantitative information was sought regarding the specific features of the ambulatory residency programs, formal teaching conferences, supervision of residents, and evaluation of residents in ambulatory care. According to the responses, the training of the small cadre of primary care residents does emphasize ambulatory medical experience, supervised by an increasing number of faculty members in general medicine. Formal post-clinic conferences, analogous to inpatient attending rounds, are held substantially more often in hospitals with primary care programs than in hospitals without primary care programs. Formal ambulatory teaching conferences stress both traditional topics important in internal medicine and psychosocial issues. However, the authors could detect little effect of these activities in primary care programs on the training of traditional internal medicine residents even within the same hospital.