This volume reports on discussions among multiple stakeholders about ways they might help transform health care in the United States. The U.S. healthcare system consists of a complex network of decentralized and loosely associated organizations, services, relationships, and participants. Each of the healthcare system’s component sectorspatients, healthcare professionals, healthcare delivery organizations, healthcare product developers, clinical investigators and evaluators, regulators, insurers, employers and employees, and individuals involved in information technologyconducts activities that support a common goal: to improve patient health and wellbeing. Implicit in this goal is the commitment of each stakeholder group to contribute to the evidence base for health care, that is, to assist with the development and application of information about the efficacy, safety, effectiveness, value, and appropriateness of the health care delivered.