The article describes the effects of systemic action-oriented group therapy in nature in the psychotherapeutic treatment of children and adolescents (n=66) with serious problems in their social behavior. These include violent behavior, mobbing experiences, threatened exclusion from school, social anxiety or difficulties in connecting with peers. Selected quantitative-empirical research results are presented. The central question of the study was, whether systemic-action-oriented group therapy a) changes the competence assessment as well as b) the psychic symptomatology and c) what are the connections between a changed competence assessment and a changed psychic symptomatology. An analogous competence assessment procedure was developed for this purpose. The psychic symptoms were measured with the Child Behavior Checklist (CBCL) and the Youth Self-Report (YSR) at three time-points.
Keywords: Group therapy; children and adolescents; nature; quantitative evaluation