A study of 319 human service workers in 22 human service organizations was used to analyze simultaneously the effects on both satisfaction and commitment of multiple predictors from the three categories of job characteristics, organization characteristics, and worker characteristics. The study shows that job satisfaction and organizational commitment are each affected by a unique hierarchy of predictors. Results indicate that two job characteristics, skill variety and role ambiguity, are the best predictors of satisfaction, while two organization characteristics, leadership and the organization's age, are the best predictors of commitment. One worker characteristic, education, was found to be a significant predictor of commitment, while no worker characteristics predicted job satisfaction.