Leadership is one of the most important areas of discussion in providing direction and guidance to organizations. This is where leaders are said to give life to the organization and their decisions, strategies and methods spell success or failure for the entire system. Among the tools suited to the investigation of leaders’ behavior and decisions is the System Dynamics methodology, in which it is possible to investigate the decision-making processes and various behaviors of leaders and to have different analyses of these for reaching organizational success. In this article, the System Dynamics approach has been employed in order to investigate the responsibility of leaders in reaching organizational excellence. The model was first designed based on cause-effect relations in the EFQM model; the relationships between the model variables were then compiled. Afterwards, various scenarios for a company in the transportation industry were put to investigation through its self-evaluation results.