The presentation deals with the question of whether children resort to an aggressive behavior because of factors in the school or whether they interpret their exclusion of school matters as a devaluation of their already low social status and choose to adopt aggressive behaviors in order to maintain their identity. This presentation attempts to clarify the term aggression and social exclusion, to present theories that try to approach the causes that lead to inter-aggression and social exclusion within the school premises, to highlight the social groups involved with the terms aggression and social exclusion and finally to deal with the educational efforts.