This book offers an original contribution to the area of international research on comparative education policies and the influence of transnational agencies on national school policy and reform. With a focus on grasping what "the Nordic model" or "the Nordic dimension" means in school and educational policy, the book explores in depth the school policy contexts of the five Nordic countries Denmark, Finland, Iceland, Norway and Sweden. It demonstrates how these particular national contexts engage with and contextualize transnational collaboration on issues like school reform, accountability, evidence and what works, and digitalization. The book situates these policy issues over a long period of time while integrating the latest developments and reforms. It demonstrates how context matters. It shows how the often elusive, but pervasive Nordic dimension can only be fully understood by painstaking scrutiny of the five national contexts, their particular trajectories and mutual interactions in formal and informal education.