Building substantially on the earlier, landmark text, What Works? (Policy Press, 2000), this book brings together key thinkers and researchers to provide a contemporary review of the aspirations and realities of evidence-informed policy and practice. The text is clearly structured and provides sector-by-sector analysis of evidence use in policy-making and service delivery. It considers some cross-cutting themes, including a section of international commentaries, and concludes by looking at lessons from the past and prospects for the future. This book will be of interest to a wide range of social science researchers, students and practitioners as well as those interested in supporting more evidence-informed policy and practice.