This series is directed to healthcare professionals who are leading the transfor- tion of health care by using information and knowledge to advance the quality of patient care. Launched in 1988 as Computers in Health Care, the series offers a broad range of titles: some are addressed to speci?c professions such as nursing, medicine, and health administration; others to special areas of practice such as trauma and radiology. Still other books in this series focus on interdisciplinary issues, such as the computer-based patient record, electronic health records, and networked healthcare systems. Renamed Health Informatics in 1998 to re?ect the rapid evolution in the discipline now known as health informatics, the series continues to add titles that contribute to the evolution of the ?eld. In this series, eminent experts, serving as editors or authors, offer their accounts of innovation in health informatics. Incre- ingly, these accounts go beyond hardware and software to address the roleof information in in?uencing the transformation of healthcare delivery systems around the world. The series also increasingly focuses on "peopleware" and the organi- tional, behavioral, and societal changes that accompany the diffusion of infor- tion technology in health services environments.