The findings of two consecutive surveys of job satisfaction and burnout in national samples of health care social workers are presented. Between 1979 and 1989, there were significant increases in the proportion of social workers employed in private versus public agencies, in quantitative workload, and in social workers' perceptions of the challenges presented by their jobs. Role conflict and role ambiguity, lack of comfort, and dissatisfaction with financial rewards emerged as significant predictors of depersonalization and burnout. However, a significant increase in social workers' feelings of personal accomplishment also occurred, and high challenge emerged as a significant predictor of sense of effectiveness.