The book presents discussions and debates from three distinct areas of service design research: societal change, value co-creation and development of service design. User participation can change society, and service design can contribute to this change. The service design approach provides tools for engaging the citizen and policy design. Service design plays a role in value co-creation and innovation processes. This role is more strategic than it is merely operative. Service design is establishing itself as a discipline. This debate includes a strong multi-disciplinary approach and the research and development of service design methods. The book includes chapters from top service design authors (Daniela Sangiorgi, Stefan Holmlid, Andy Polaine, Nicola Morelli etc.) and interesting case studies (Arne Van Oosterom and Tim Schuurman from Designthinkers and Erik Widmark and Emma Johansson from Transformator etc.) from design consultancies and researchers. This book has a blog, http://www.sdwiththeory.com/, where information about the book will be available, and a twitter handle, @SDwithTheory, to receive ideas and feedback about the book.