The relationship between social support and various parameters of psychological well-being was examined with 96 third-year medical students at a large, metropolitan medical school. Assessment instruments included the Social Support Networks Inventory, the Social Readjustment Rating Scale, the General Well Being Scale, the Zung Self-Rating Depression Scale, and the Taylor Manifest Anxiety Scale. Findings include the following: the mean number of network members for students was 7.88; a typical support network included both parents, a sibling, a close friend of either sex, or spouse; on the average, networks consisted of 17.3 percent medical students and 7.04 percent physicians (mostly faculty or house staff); students had known each network member an average of 14.11 years; and students less frequently listed faculty, administrators, clergy, or other relatives as part of their support network. Although the sample experienced a fairly high number of life event changes, overall they were feeling psychologically well, as evidenced by their good general well-being scores. The Zung scores indicated that these students were slightly more depressed than the general population, but this difference was not statistically significant. (SW)