“…Nevertheless, because of the variety of assessment methods, it is difficult to make comparisons and, consequently, there are results that lead to conflicting conclusions about the factors that improve school climate. However, there is strong evidence that peer support improves the school climate, even though in the early stages of implementation, results can show an increase in conflicts (Del Barrio, Barrios, Granizo, Van der Meulen, Andrés & Gutiérrez, 2011;Cowie, 1998;Cowie, Naylor, Tallamelli, Chauhan & Smith, 2002;Cowie & Olafsson, 2000;Cowie & Wallace, 2000;Houlston, Smith & Jessel, 2009;Mental Health Foundation, 2002;Naylor & Cowie, 1999;Naylor, Cowie & Del Rey, 2001;Ortega, Del Rey & Mora-Merchán, 2004;Smith, 2003;Smith, Pepler & Rigby, 2004;Smith & Watson, 2004). More precisely, in studies that have used control groups, results to date have not been homogeneous and have not revealed differences in evolution, in specific cases, between experimental and control schools (Svensson, 2003).…”