“…Researchers have also analyzed how leadership is exercised at different levels of the school system. These have included studies of leadership in early childhood settings (e.g., Ho, 2005;Ho & Tikly, 2012;Leeson, Campbell-Barr, & Ho, 2012), primary schools (E. H. F. Law, 2011), secondary schools (M. Lee, Hallinger, et al, 2012;Pang, 2010;Walker & Ko, 2011), and the school system (Y. C. Cheng, 2000a; Y. C. Cheng & Walker, 2008;Dimmock & Walker, 1998c;Hallinger, 2010). Studies of leadership effects are linked to the second most-studied topic, school change, effects, and improvement.…”