4. Conclusion... provisional

After this review of various aspects, we can practically recommend that, for better control of risks where human and organizational factors are not the sad inevitability, we take care to :

• the operators' ability to understand and evaluate the rules and procedures adapted to their skills;

• operators' ability to anticipate, and each player's visibility of what is happening upstream, downstream, and around its perimeter;

• reaction capacity, reserves, organizational flexibility, confidence in the extraordinary capacity of human beings to adapt;

• learning (individual and organizational), sustainability of hard-learned lessons;

• participation: those who will take part in the performance (and possibly in accidents) must...