This training is part of the training policy of labor inspectors in risk detection, with a view to preventing and reducing accidents at work. About forty risks from OSHA standards are hidden on a construction site. They appear randomly, depending on the duration and difficulty of the exercise. The learner's objective is to identify these hazards and answer questions relating to the identified hazards. A correction at the end of the exercise measures the number of risks detected and reminds the learner of the procedure for undetected risks.