The Management of companies has lived, since the end of the Seventies, a noteworthy metamorphosis articulated mainly around the human capital that represents, henceforth, a predominant component in the strategic equation. Yet, the development of competences remains dependent on managerial ethics to provide to the company the keys to success. Within the framework of this research, we propose to highlight the bond involving ethics, decisional system of the management system and the development of competences (valorization, construction, unlearning) and to see in which measurements ethics makes it possible to develop competences. These theoretical results were the subject matter of an empirical validation which leads us to confirm that ethics reaches the development of competences.