A Patient Safety Organization (PSO) is a group, institution, or association that improves medical care by reducing medical errors. Common functions of patient safety organizations are data collection and analysis, reporting, education, funding, and advocacy. A PSO differs from a Federally designed Patient Safety Organization (PSO), which provides health care providers in the U.S. privilege and confidentiality protections for efforts to improve patient safety and the quality of patient care delivery (see 42 U.S.C. 299b-21 et seq. and www.PSO.AHRQ.gov.)