This series is directed to Health care professionals who are leading the transfor-mation of health care by using information and knowledge. Historically the series was launched in 1988 as Computers in Health Care, to offer a broad range of titles: some addressed to specific professions such as nursing, medicine, and health administration; others to special areas of practice such as trauma and radiology; still other books in the series focused on interdisciplinary issues, such as the com-puter based patient record, electronic health records, and networked Health care systems. Renamed Health Informatics in 1998 to reflect the rapid evolution in the discipline known as health Informatics, the series continued to add titles that con-tribute to the evolution of the field. In the series, eminent experts, serving as editors or authors, offer their accounts of innovations in health Informatics. Increasingly, these accounts go beyond hardware and software to address the role of information in influencing the transformation of Health care delivery systems around the world. The series also increasingly focused on the users of the information and systems: the organizational, behavioral, and societal changes that accompany the diffusion of information technology in health services environments.