“…Most popular leadership paradigms include moderator variables such as nature and structure of organizational factors (Howell, Dorfman, & Kerr, 1986). Previous research works show that there are links between instructional leadership and school effectiveness (Hallinger & Murphy, 1985;Nguyen, Hallinger, & Chen, 2018), however, there is a lack of studies examining school level as a moderator variable that affects the relationship between instructional leadership and school effectiveness. According to Bendikson, Robinson, and Hattie (2012), even though school effectiveness increases when school's leadership focuses on instruction, it is unclear if the impact is the same for primary and secondary level.…”