“…role, uncertainty about expectations for leadership roles, and unpreparedness for leadership roles (Baecher, 2012;Reeves and Drew, 2012). External factors involve shifting from teacher to teacher leader (Smith et al, 2017), colleagues' attitudes and capacity (Avidov-Ungar and Shamir-Inbal, 2017;Montecinos et al, 2014), and the shifting nature and structure of peer relationships as a challenge to typical egalitarianism among teachers in schools (Margolis, 2012;Smith et al, 2017;Wenner and Campbell, 2017). c) Organisational Level At the organizational level, this review highlights the positive impacts of teacher leadership on school-level factors such as: supporting positive culture (e.g., Beachum and Dentith, 2004); promoting professional learning communities (e.g., Friedman, 2011;Hairon et al, 2015); and supporting curriculum reforms (e.g., Hofstein et al, 2004;Lai and Cheung, 2015).…”