Violence in the school environment is a real phenomenon, with various complex ways an expression. So, sometimes, the school becomes the manifestation of the conflict between students and between teachers-students, area where inappropriate behaviour is observed. Family environment is considered to be an important source of student aggression. Studies show that a large number of violent students come from dysfunctional families and live in single parent families. Sometimes school teams are composed of students from different schools and this situation creates conflicts that progresses in violence.