This important book challenges methods and assumptions in engineering and product design. It shows how good design that takes into account the experience of being disabled can create products that effectively meet the needs of disabled people and people without disabilities too. Graham challenges assumptions about what disabled people 'need' with insightful examples, and uses a series of case studies to demonstrate good design. Read this book if you're an design engineer or designer, what ever your discipline. Ultimately all technology is assistive technology and interfaces impacts the life of a human being.