“…Two previous quasi-experimental studies utilizing archival school-level data (Flay & Allred, 2003) reported beneficial effects on student achievement (e.g., math, reading, and science) and serious problem behaviours (e.g., suspensions and violence rates). As practitioners, policymakers and researchers have implemented programs and sought to raise academic achievement and to address negative behaviours among the youth, an increasing amount of evidence indicates a relationship among multiple behaviours (Botvin, Griffin, & Nichols, 2006;Catalano, Berglund, Ryan, Lonczak, & Hawkins, 2004;Flay, 2002). Several mechanisms involving multiple behaviours have been identified in improving student behaviour and performance (Domitrovich, Cortes, & Greenberg, 2007;Zins, Weissberg, Wang, & Walberg, 2004).…”