This study examines the different ways in which needs are assessed and health care is organized and delivered. These matters are considered in the light of rapid change in patterns of health and illness; also the relationships between purchasers, providers and users of health services; and finally, in the politics of health service organization and funding. Exploring alternative ways of studying the people's health, the authors review the relationships between lay and expert knowledge, and question whether this is a meaningful distinction when addressing public health issues. The book is aimed at professionals and academics, and should be of particular interest to people working in public health and health services.