“…Factors that affect the development of teacher leadership include school principals supporting the staff in different aspects (Hart, 1994;York-Barr & Duke, 2004;Wenner & Campbell, 2016), giving teachers time to develop themselves (Chew & Andrews, 2010), the existence of learning communities in schools that ensure professional collaboration (Hunzicker, 2012;Chamberland, 2009), and an environment of trust and peace at school (Beachum & Dentith, 2004;Gordin, 2010;York-Barr & Duke, 2004). However, teachers' lack of time, poor communication, structural factors and personal characteristics (Wenner & Campbell, 2016), lack of shared vision (Brooks, Scribner, & Eferakorho, 2004), excessive workload, insufficient support (Adams & Gamage, 2008), and an authority and autonomy gap (Friedman, 2011) weaken teacher leadership. Consequently, it can be argued that teachers' leadership behaviors increase with the levels of schools regarding task-oriented, support-oriented, bureaucratic, and success-oriented culture.…”