The conflicting priorities of organisational change, financial constraint and patient care contribute to the difficulties of providing clinically effective services. This book shows how a purchaser in these new environments can influence current and potential services. Services which are failing or perceived to be failing by the public are highlighted, and suggestions given for changes that can be made to improve them. Scientific findings are summarised and standardised, and how these new approaches can be integrated into purchasing shown. It is a practical book illustrated by examples and explanations, which brings clarity to a complex subject. It will develop the reader's knowledge and skills essential to undertake purchasing.