"A useful contribution to discussions of methodologies for examining the role of scientific experts in public policy debates."—New Genetics and Society "Hilgartner's portrait of the emergent debates over diet, health, and disease prevention, and of the NAS and its proceduces for producing expert advice, is thorough and interesting. . . . For those interested in the burgeoning field of science and technology studies, for socioloists of knowledge and the still-lively crowd of Goffman students, this book will be quite interesting. . . . What remains most impressive about the book is how it quietly performs that magic trick of a useful sociology: to make visible the invisible."—American Journal of Sociology