The aim of the present study is to propose and to test three models in order to examine the mechanisms through which dimensions of transformational leadership influence different forms of organizational commitment by testing the possible mediating role of leader-member-exchange (LMX) dimensions. A model of antecedents of each of the three components of organizational commitment is developed, where antecedents are dimensions of transformational leadership and leader-member exchange. In the model of affective commitment, the contribution dimension of LMX acts as a consequence, rather than an antecedent of commitment. These findings are important since they may serve as a bind between leadership styles and the kind of commitment that each of these styles can generate in followers.
