In the current literature, it is now obvious that PSM is related to OC (Camilleri, 2007; Castaing, 2006; Horton & Hondeghem, 2006). Therefore, it seems logical that HRM practices correlated with organizational support and trust in management should also be correlated to PSM and perceived organizational efficiency. Social exchange theory may also explain why HRM practices aiming to develop extrinsic work incentives are less correlated to PSM. Performance-related pay, for example, is a relatively new HRM in studied organizations. Therefore, public employees might not see them as reliable enough to fulfill individual expectations. HRM prac- tices providing extrinsic work incentives might not inspire enough confidence to generate motivation. Finally, we could argue that it would be very interesting in future research to integrate trust as an antecedent of PSM. We would recommend that trust be considered an important component of psychological mechanisms like motivation and commitment, as well as PSM, as there remains a lack of information on this specific issue.