“…Previous research mostly conducted in Europe and USA has demonstrated that the structural levels in the education system below (classroom, department) and above (municipality, province, country, etc.) the school level, have played an important role in different contexts when exploring the relative importance of schools (Bosker and Scheerens, 1989;Goldstein, 1997;Opdenakker and Van Damme, 2000;Thomas, 2001;Luyten, 2003;Van den Noortgate, Opdenakker and Onghena, 2005;Cervini, 2009;Martínez, 2012). By not specifying levels both below and above the school in multilevel analyses when estimating school effects, model results can potentially be both miss-specified and misleading in terms of overestimating school effects.…”