Book excerpt: The International Handbook of Educational Effectiveness and Improvement draws together leading academics and researchers in the field to reflect on the history, traditions and the most recent developments in this dynamic and influential field. This handbook provides a comprehensive overview of: the foundations of the field the evolution of educational effectiveness theory and methodology the links with other research disciplines the links between policy and practice. In conclusion, the handbook sets out a new agenda for future educational effectiveness research. This handbook is an essential resource for those interested in the effectiveness of educational systems, organisations and classrooms. It offers academics, researchers, students and policy-makers new insights into the latest thinking and evidence about educational effectiveness.