This book explains what types and sources of information are available to bring evidence into practice. Critical appraisal of evidence by the user is the key to effective use of information for care. Equally important is the understanding and utilisation of the data generated by local practice, as key evidence for service review and development. This book is aimed at all professions and disciplines, avoids specialist prior knowledge, and puts the concept of evidence-based care into a practical context. Harnessing Health Information is a new series seeking to make information more understandable and accessible. It is written for the full range of practitioners, managers, and support staff. Its intention is to take the threat and the mystique out of information and instead to give confidence in how to find, appreciate, and use information as a key resource for those who deliver, plan, or manage healthcare.