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Schools are regularly confronted with the question of violence. From nursery to secondary school it can be found in various areas : pupils against themselves, between pupils, families and teachers, but it is also visible in the violence that the school institution shows towards its pupils as well as the professionals working there. In the past ten years, « dangerous games » have appeared. We aim at presenting the various forms of these violent practices, better understanding their repercussions and implementing the devices that could prevent this violence to best help the pupils concerned.