“…Critical events such as accidents, acts of violence and racism occur all too often and, to a greater extent and intensity, are present in the school environment, thus increasing uncertainty (Adamson & Peacock, 2007;Seldak, 2010). They bear a negative effect on the physical and mental health of the school community members, thus deregulating the learning and edification process (Brock, Sandoval & Lewis, 2005;Felix et al, 2010;Hatzichristiou et al, 2011;Heath & Sheen, 2005;Robers, Zhang, Truman & Snyder, 2012;Starr, 2012). In addition, they make teachers experience increased uncertainty about their work environment and this unavoidably bears a negative effect on their teaching and school-based extracurricular activities, as well as on the school climate (Cornell & Mayer 2010;Heath & Sheen, 2005) -the importance of which has been repeatedly established in pertinent literature (e.g.…”