Executive Summary Data Governance and Stewardship: Designing Stewardship Entities and Advancing Data Access American society is now engaged in an epic struggle over health information, and in particular, regarding its availability under proper security safeguards, for research into matters of quality, efficiency, population health improvement, and the reduction of disparities in health and health care. This expanded use of health information, an inevitable step in an information age, is considered by experts to be essential to true health system reform. Furthermore, models exist for the creation of data-sharing arrangements that promote such uses in a safe and secure environment and with attention to ethical standards. Data stewardship is a concept with deep roots in the science and practice of data collection and analysis. Reflecting the values of fair information practice, data stewardship denotes an approach to the management of data, particularly data that can identify individuals. The concept of a data steward is intended to convey a fiduciary (or trust) level of responsibility toward the data. Data governance is the process by which responsibilities of stewardship are conceptualized and carried out. The legal environment poses a number of barriers to the use of personally identifiable health information, and the evolution to a system in which information is made available under appropriate stewardship and governance conditions will be slow. Health information privacy concerns on the part of consumers and patients are often considered to be the principal barrier, but equally important are the privacy interests of providers. Equally important is the concept of data ownership and control for business purposes, given the immense value placed on the sale of data. Significant movement to a more open data sharing world operating under concepts of privacy, security, stewardship, and accountable governance, will be possible as security safeguards grow and as government steps in to begin to develop the links between participation in government programs and the disgorgement of information under controlled circumstances.