“…Despite some unclear findings about how principals influence student achievement or school performance (e.g. Hattie, 2009;Hochbein & Cunningham, 2013), many more studies have shown that principals have an important effect on student achievement (Boberg & Bourgeois, 2016;Chiang et al, 2016;Cotton, 2003;Dempster, 2001;Grissom et al, 2015;Hallinger & Heck, 1998;Hattie, 2015;McCullough et al, 2016;Pelfrey, 2006;Stronge et al, 2008;Tan, 2018). One intermediary explanation for this relationship may be that principals influence teachers; this is valid since many studies have confirmed that principals' instructional leadership affects teacher practices (Lambersky, 2016;Mangin, 2007;Proffitt-White, 2017;Quinn, 2002;Rigby et al, 2017;Supovitz et al, 2010).…”