The domains concerned by studies of risks project are:
The technical or operational performances (delivered product no - compliant to the specifications, refusal of the users);
The financial means and the budgets (unavailability of resources or on costs);
The scheduling (delays of delivery with or without on costs).
To answer if need be increasing of the modern societies to evolve in minimal situation of danger, the management of the risks became, since several years, a complementary activity and no get round of the engineering activities in a project or exploitation of an operational system. Their large scientific and technical expertise, their rigorous and effective methodologies are incontestable assets. In these works of research, we propose a precious support so much to the level of the reflection that of the methods for all engineers and more globally all people, starting or experienced, brought to undertake a gait of management of the risks in a very open panel of activities, and of the multi-dimensional analyses of the risks project management.