This book would not have happened without the support of the Economic and Social Research Council. Its four years funding for the Innovate Project enabled us to conduct the evidence review upon which this book is based and gave us the time to write it. We are grateful for the ideas shared by, and the many discussions with, all members of the Innovate Project. In particular, we thank Katie Latimer, now moved on, who contributed to the original evidence review, and Kristi Hickle and Gillian Ruch, who read draft chapters. We owe a particular debt of gratitude to Lauren Wroe, from Durham University, who provided a thorough critical and textual review of the whole text. We wish to acknowledge the additional financial support from the University of Sussex and Durham University, which has enabled the electronic version of this book to be published open access. We hope that this means it will be shared widely in the practice field to facilitate the further development of services. Finally, we acknowledge the important contribution to this book of all the young people, parents, carers and practitioners who, in the studies we reviewed, shared their perspectives on service approaches to preventing and addressing extra-familial risks and harms. newgenprepdf 1 ONE The emerging concept of extra-familial risks and harms