The purpose of this research is to show the importance of the actions of the specialist prevention educators (OPI: Orientation - Prevention - Insertion) of the Neuhof against the phenomen a of violence. Through this work, we try to deconstruct certain notions often amalgamated by the media, politicians, public opinion: ordinary juvenile violence, urban violence, young people from suburbs, suburbs, etc.In this thesis, we take an interest in the preventive measures against ordinary / urban juvenile violence, social violence (precariousness, etc.) as well as their implementation and the distance existing in matter between the ambient discourses and the reality in the field.