This book provides a fresh and comprehensive understanding of the most significant methodological advances in the study of transformative change through policy decision-making; this latter being commonly influenced by metrics and evaluation processes.In this vein, the book presents methodological approaches to the study of sustainable transitions by suggesting that these metrics and evaluation processes can play a new role.It contends that using these approaches in the implementation of policy programmes, projects, and interventions can offer a further reflexive perspective, which helps transformations to take place and enhance metrics' transformative potential.We hope that this book stimulates further development of the emerging research agenda on transformative metrics.