The job of school leaders has changed radically as countries transform their education systems to prepare young people for today's rapid technological change, economic globalisation and increased migration. One new role they are being asked to play is to work beyond their school borders so that they can contribute not only to the success of their own school but to the system as a whole - so that every school is a good school. This book explores what specialists are saying about system leadership for school improvement. Case studies examine innovative approaches to sharing leadership across schools in Belgium (Flanders), Finland and the United Kingdom (England) and leadership development programmes for system improvement in Australia and Austria. As these are emerging practices, the book provides a first international comparison and assessment of the state of the art of system leadership.Companion Volumes: Improving School Leadership, Volume 1: Policy and Practice reports on an OECD analysis of school leadership around the world. Offering a valuable cross-country perspective, it identifies four policy levers and a range of policy options to help improve school leadership now and build sustainable leadership for the future, Improving School Leadership: The Toolkit is designed to support policy makers and practitioners to think through reform processes for schools and education systems in their national context. It is available as a free download at www.oecd.org/edu/schoolleadership. Effective school leadership is viewed as key to education reform worldwide. These books will be of interest to policy makers, school boards, school administrators, principals, teachers and parents.