Book excerpt: This book describes and analyses the organisation, functions and development of national educational authorities and agencies and the influence they have on local schools in 20 countries around the world. It examines the governing chain in the respective countries from both a theoretical and descriptive perspective. It does so against the background of the stability and rigour of the governing chains having been challenged, with some researchers considering the chain to be broken. However, the view that comes to the fore in this book is that the chain is still present and contains both vertical implementation structures and intervening spaces for policy interpretation. How schools become successful is important for the individual students as well as the local community and the national state. A vast quantity of research has looked at what happens in schools and classrooms. At the same time, national governance and politics as well as local prerequisites are known to exert influence on schools and their results to a high degree. Societal priorities, problems and traditions provide variety in how governance is executed. This book provides an international overview of the similarities and differences between educational agencies and how their work influences schools.