Principals are at the junction between classrooms, policies, local administrations and stakeholders. In this unique and challenging position they can influence the conditions and climate in which teaching and learning occur and with this - the effectiveness of schooling (OECD/Specialists Schools and Academics Trust, 2008, Scheerens and Bosker, 1997, Teddlie and Reynolds, 2000, Townsend, 2007). Principals also are the key mediators between schools and the environment in which schools operate.