“…Four domains of the instrument were identified in the initial version through literature review, qualitative interviews, and focus group, which were; (i) the role of secondary school head (SSH) as a transformational leader (TL) in improving TPC, (ii) the role of SSH as an instructional leader (IL) to improve TPC, (iii) the role of SSH as a distributed leader (DL) to improve TPC, and (iv) the role of SSH as an authentic leader (AL) to improve TPC (Ahmad & Batool, 2018;Asim et al, 2023;Bahzar, 2019;Bush et al, 2018;Bush & Glover, 2014;Danbaba & Panshak, 2021;Gougas & Malinova, 2021;Gumus et al, 2018;Leithwood, 2005;Sharif, et al, 2020). The role of SSH or SL as TL encourages and inspires teachers to innovate and develop new ways to improve their pedagogical competence (Andriani et al, 2018;Belan & Niron, 2021;Eliophotou-Menon & Ioannou, 2016;Onorato, 2013;Susilawati et al, 2022). In the instructional leader role, SSH/SL focuses on teaching and learning and improves students learning and teachers' effectiveness (Bada et al, 2020;Bellibaş et al, 2021;Fink & Markholt, 2011;Ismail et al, 2018;Nguyen et al, 2022;Shava et al, 2021;Sibomana, 2022;Wahab et al, 2020).…”