Management by definition is an "Anglo-Saxon" word, developed in the United States, it is the art of managing people in a company; to organize the mobilization of knowledge, resources (human, financial and material) and by applying methods. A good management, allows the company to adapt every day to internal and external constraints, to evolve, to guarantee the survival of the company, because it is a living organism in perpetual danger. However, what is a manager? A manager is an executive who leads a team, he defines the methods and priorities that will achieve the company's objectives. He is the master of maneuver. He must have skills, qualities (competent, extroverted, strong listening skills, pragmatic with a good sense of anticipation ...), a high leadership capacity, experience, a sense of coordination and team leadership. It is a position that gives a lot of responsibility and power; therefore one has to accept the principles that are incorporated in it as being observed, commented, criticized.