Working with partners including the Department of Education at Oxford University, the Centre for Equity in Education at the University of Manchester, the University of Glasgow, the University of Nottingham and the Hong Kong Institute of Education, "Education Development Trust" has commissioned a series of reviews of international literature. These reviews cover a range of topics related to school improvement including assessment for learning; the inclusion of students with special educational needs; effective teaching practice; school self-evaluation; and successful school leadership. The idea that schools can impact positively on student outcomes is a crucial driver in the rise of interest in school improvement research and practice. These reviews highlight international examples of best practice in order to effect change and identify how effective school improvement manifests itself. It forms a useful tool for schools and school leaders, but also acts as a lesson for policymakers in terms of what works around the world. This review focuses on: "Successful Leadership." School leaders are under considerable pressure to demonstrate the contribution of their work to school improvement, which has resulted in the creation of a wide range of literature which addresses leadership in the context of school improvement. This review pays particular attention to issues including transformational leadership, instructional/pedagogical leadership and distributed leadership. School leaders, particularly principals, have a key role to play in setting direction and creating a positive school culture including the proactive school mindset, and supporting and enhancing staff motivation and commitment needed to foster improvement and promote success for schools in challenging circumstances.