In order to encourage "voluntary, provider-driven initiatives to improve the safety and quality of patient care," the Agency for Healthcare Research and Quality (AHRQ) is spearheading the certification of Patient Safety Organizations (PSOs)—public or private organizations with expertise in the analysis of patient safety and hazards in health care. This Web site provides information on the rules governing PSOs and the requirements for an organization to be listed as a PSO. Development of PSOs was authorized by the 2005 Patient Safety and Quality Improvement Act.