The accessibility of health information on the Internet has revolutionized access to clinical information for health practitioners and patients. This access to information has the potential to make a major contribution to health care. However, the effective use of this accessibility depends on an understanding of all the issues involved, from the underlying technologies and economic pressures, to questions of how best to manage quality and privacy, how people seek and use information, and what the barriers to its use are. Cullen's book also examines the extent of health information on the Internet, the providers of websites and their content, and outlines the nature of the paradigm shift affecting knowledge in the health sector.