Prior research reports of a weak commitment-performance relationship can be attributed to inconsistency in conceptualization and measurement of the constructs. In this study, we differentially relate attitudinal commitment to internal (organization and supervisor) and external (customer) foci to objective measures of job performance. Results suggest that both internal foci are related to organizationally rewarded job performance and that the external focus influences job performance relevant to and rewarded by customers. Implications of these findings are discussed.