The Patient Factor: Theories and Methods for Patient Ergonomics, Volume I defines Patient Ergonomics, explains its importance, and situates it in a broader historical and societal context. It reviews applicable theories and methods from human factors/ergonomics and related disciplines, across domains including consumer technology, patient-professional communication, self-care, and patient safety. The Patient Factor is ideal for academics working in health care and patient-centered research, their students, human factors practitioners working in healthcare organizations or at technology companies, frontline healthcare professionals, and leaders of healthcare delivery organizations.