A sample of 146 physicians from internal medicine, family medicine, and psychiatry responded to two written clinical vignettes describing patients with combinations of commonly seen somatic and psychologic complaints. The physicians included housestaff of all levels of training, full-time academic faculty, and community-based clinical faculty. Enormous variation was seen in all specialties in the numbers and types of problems and diagnoses suggested by the physicians. Aside from one or two areas, there were few differences among the specialties or by level of training with regard to the numbers or types of problems identified and tentative diagnoses recorded. The variability within specialty groups was greater than among the groups. Physician behavior in response to one vignette was highly correlated with responses to the second vignette.