“…Many studies have discussed theoretical models for aggression, which describe the relationship between aggressive factors (e.g., depression, low self-esteem or family conflicts), expressed aggression (as the behavioral reaction to potential aggressive factors with indicators such as violence and anger) and aggression outcomes (e.g., criminal behavior or academic failure) (Nissimov-Nahum, 2009;Coie and Dodge, 1998;Findling, 2003). Studies have shown that the occurrence of aggressive factors is related to expressed aggression (Haapasalo & Tremblay, 1994;Park, Choi & Lim, 2014) as well as aggression outcomes among students (Wang et al, 2013;Park, Choi & Lim, 2014;Kim & Lee, 2008). Furthermore, expressed aggression is related to negative aggression outcomes, and high levels of expressed aggression seem to be a serious issue for many students (Kim & Lee, 2008).…”