Patients are increasingly encouraged to take an active role in managing their health and healthcare. New technologies, cultural shifts, trends in healthcare delivery, and policies have brought to the forefront the "work" patients, families, and other non-professionals perform in pursuit of health. This volume provides a theoretical and methodological foundation for the emerging discipline of Patient Ergonomics – the science of patient work. 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 healthcare 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.