[The particularity of large-scale simulation: from learning by observation to professionalization].

A full-scale exercise designed to test emergency plans, large-scale simulation in the face of nuclear, radiological, biological, chemical and explosive (NRBCe) risks also contributes to the health response and the organization of the health system. For future caregivers working in hospitals, it allows them to take into consideration the impact of an event outside the hospital on their hospital care. It enables them to pool their responses to a possible disaster, in particular by identifying the health response (Health Response Organization) and the security response (Civil Security Response Organization).