Organizational structure is a construct that has had an important role in terms of the performance of an organization. Therefore, the effective management of an organization has been systematically and consistently linked, with the deep understanding of the importance of the organizational structure and its proper design, or its re-engineering. The external, organizational environment is at the present, so fluid that decisions concerning structure and corporate restructuring have become central. It has been emphasized that the structural decisions concerning the organizational structure are undoubtedly among the most important decisions undertaken by the leadership. This can be justified, as the organizational structure determines the ways in which overall work and tasks are formally divided, grouped and proper ways of coordinating them, are developed. The structure, therefore, is not something simple. It reflects the theory of each organization, regarding the way it trusts, that the various tasks within, should be separated / grouped, in ways that can efficiency , can be achieved.