The book focuses on what we know about contemporary educational improvement, transformation, and change. It will provide insights into what strategies work, long term, to build the capacity for principled change at the school and system level. Failed strategies and approaches such as standardized testing, government mandates, and aligning to PISA testing are examined for their true worth. The book will consider what leaders can do to secure principled school and system improvement which fully embraces diversity, equity, and equality. It will also dispel myths about reform at scale and challenge prevailing ideas about educational change that, it will be posited, are not helping many young people to reach their potential.