Taking the time to train, exchanging with their peers in order to step back and thinking about improving their management practices is a lasting guarantee of performance for the company. Whatever the position, top or middle management, the manager now has a huge responsibility and must use their leadership, group management, and communication skills. He/She must guide their team and promote a relational environment conducive to collective performance. As an HR actor, he/she values and aims for the development of their partners, acts as a coach and is the guarantor of the “welfare" of their team. Alternately leader, organizer, project manager’s, the manager must demonstrate great flexibility.