Abstract: Managing accidents and crisis is a complex task, which is achieved by a large number of stakeholders. In order to identify appropriate responses to risk-prone situations, a classification in two categories has been proposed: risks of damage and risks of crisis (Wybo 2004). Risks of damage correspond to emergency management procedures and plans. Risks of crisis correspond to situations that escape from planning because of the overflow of the organization. Resilience of organizations is defined as their ability to resist to chaos and to maintain the situation under control. From the analysis of a large number of emergencies and crises caused by industrial and natural hazards, we try to identify what conditions increase the resilience of organizations. They have in common to increase the mutual knowledge of stakeholders about their strategies and roles and about the development of the situation.