Instrumentation
A set of 7-point Likert scale (ranging from 1 = “not at all relevant” and “7 – “very relevant”) instrument, so-called Niche-Malaysian Teacher Leadership (NMTL) measurement model was administered to the samples. The samples were required to complete their demographic information and response to the 34 items which may address an early indication of the importance of each standard to develop teacher leaders in Malaysian classrooms. The Niche-Malaysian Teacher Leadership (NMTL) measurement model, comprised of 7 standards was adapted from [27]. Nonetheless, the 34 items were newly generated by a group of researchers based on literature review and comprehensive discussions with a group of schoolteachers. Five of its items measures the importance of teacher leaders to facilitate improvement in instruction and student learning (Standard 1); the following five items measures the importance of teacher leaders to demonstrate leadership attributes and skills (Standard 2); the next five items measures the importance of teacher leaders to develop the organization (Standard 3); six items measures the importance of teacher leaders to foster a collaborative culture to support educator development and student learning (Standard 4); five items measures the importance of teacher leaders to practice professional learning for continuous improvement (Standard 5); four items measures the importance of teacher leaders to improve outreach and collaboration with communities and other constituents (Standard 6) and the last four items measure the importance of teacher leaders to make exemplary contribution towards becoming referral leader (Standard 7).