This work: 1) categorizes the estructural and familiar causes, which take the children to institutions; 2) also analyzes the establishment children 'S aggressivity and self-steem; 3) hypothesis: the establishment children are more agressive and l e s ~se lf-steem than the non-establishment ones. The data were collected from a sample of 733 establishment children. A Cluster Analysis and a Factorial Analysis detect ,three factors: 1) familiar adversity and violence, clustering: familiar violence, familiar rupture, negative parentals models, familiar adversity, social deprivation and mental disease; 2) delinquence, and 3) the lack of family. Three questionnaries of aggressivity (emited, received and inhibited) were applied and another of self-steem. The Factorial Analysis of these Scales presents 18 factors of aggressivity and 4 factors of selj-steem. The comparison establishment children versus non-establishment in 22 factors verifies the hipothesis.