The study of dynamics in relation to performing in small groups has increased pedagogic knowledge about teamwork. The successful management of patients with life-threatening pathologies depends highly from a succession of teams with a specific mission as: the call centre 144, Paramedics, the ED, the Operating Theatre and the Intensive care. To enable each team to operate successfully, it is essential to coordinate their qualifications and synergism. This can be efficiently attained by simulating real situations and by following protocols dedicated to teamwork. Emergency Medicine, which is on the brink of acquiring its proper curriculum, must adopt this concept to integrate knowledge and know-how, and the art of being and doing. At this stage, the Emergency Physician will have the competence which will enable him to be a real "team leader".