“…Externalizing behavioral problems are of particular concern at middle school where they may disrupt the school routine, inhibit learning and create interpersonal problems for those involved. They are associated with short and long-term adverse academic and psychological outcomes in youths (Schwartz, Lansford, Dodge, Pettit, & Bates, 2018). Moreover, minor forms of conduct problems can become more severe (Lewis et al, 2017), and schools that do not effectively prevent this growth may create a condition in which violence is normatively acceptable (Wittmer, Sinclair, Martin, Tucker, & Lang, 2013).…”