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the model includes several categories of moderating variables that were proposed to shape principalleadership practice (for example, community context, institutional context, personal characteristics).It distinguished these from mediating variables (for example, instructional organization, instructionalclimate) through which principal leadership was proposed to impact student outcomes.A substantial international body of empirical research has accumulated that supports the efficacyof this framework (Hallinger, 2011a; Hallinger and Heck, 1996; Leithwood et al., 2006;Mulford and Silins, 2003; Robinson, 2006). This research yields three broad conclusions.
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