Ensuring safety involves the use of models and techniques to identify, assess and treat the impacts of multiple hazards. It also requires the organization of activities that concern the people in charge of operations, as well as product designers and project managers. These activities take place in an environment including many other stakeholders (administration, subcontractors, etc.). The overall management of these activities is therefore very complex. A weakness in this managerial activities leads to a high probability of accidents. Control of this management is therefore fundamental.