This book covers how populations of different ages use informtion technologies, the evolving abilities of children, their differences from adults cognitively and physically, usability testing, and design recommendations for genres of computer technology. It discusses development of methodologies for designers of systems to support people with cognitive impairment. Highlighting the challenges associated with designing for uses with physical impairments, the book examines HCI issues associated with information systems used by consumers, patients, and providers as well as future opportunities and challenges for HCI in healthcare.