“…The studies of this period concentrated on the characteristics of the school environment such as school climate, collective efficacy, trust in and commitment to the school, and school quality and development as well as student achievement. (Hallinger, 2015;Lee, Hallinger & Walker, 2012;Hallinger & Lee, 2014;Kaparou & Bush, 2015). After all, it is obvious that current research on instructional leadership mostly focuses on teacher performance and commitment, collective teacher competencies, roles and responsibilities of teachers, professional learning community and professional attitudes (Al-Mahdy, Emam, & Hallinger, 2018;Brandon, Hollweck, Donlevy, & Whalen, 2018;Hallinger, Walker, Nguyen, Truong and Nguyen;2017;Hallinger, Hosseingholizadeh, Hashemi & Kouhsari, 2018;Zheng, Yin & Li, 2018).…”