“…impulsivity -Neuhaus & Beauchaine, 2013), insecure attachment patterns (Zucker et al, 2003), disordered affect regulation and weakened impulse control (Clarkin & Posner, 2005;Coan & Allen, 2008;Fajkowska-Stanik & Marszał-Wiśniewska, 2004), adverse environmental conditions (war, disease in the family, poverty, social isolation of the family -Wiliams, Konger, & Blozis, 2007), dysfunction of the family unit or the individual (Borecka-Biernat, 2000, 2003Dishon, French, & Patterson 1995;Kucharewicz, 2015) as well as prior experiences such as being affected by violence (Alink & Egeland, 2013;Perry, 2008), problems at school (Valjaranta, Tolvanen, Aunola, & Nurmi, 2014) or negative effects of peer pressure (Elliot, 1994;Österman et al, 1994;Thornberry, Lizotte, Krohn, Farnworth, & Jang, 1994). Furthermore, key determinants for the development of mental health disorders are recognized to comprise processes arising from interactions of previous factors in interpersonal relationships or in relation to social tasks and challenges such as fear of rejection or instability of family relationships (Eisenberg, Zhou, Spinrad, Valiente, Fabes, & Liew, 2005), hostility understood as a personality trait and/ or abnormally increased anger manifested at the behavioural level (McGirr, Paris, Lesage, Renaud, & Turecki, 2007;McGirr et al, 2008), which may find its expression either in externalizing behaviours (frequent dissatisfaction, oppositional behaviours, physical confrontations) or in the form of internalization (intensive dysphoria, irritability, anxiety, emotional lability). A meta-analysis of studies investigating factors which determine adoption of the role of perpetrator of peer violence (Smith, 2011) demonstrated that the role is more commonly assumed by adoles-cents with a higher-than-average level of anxiety and sadness, and a lower level of self-esteem.…”