The naming and explaining of the variations in human mental and physical capacities has taken many forms through the centuries. In the modern era, medical and psychological science has succeeded in establishing the category of 'disability' to name those individuals who are understood to lie on the margins of human normalcy. 'What is disability, and how should we think of and treat those human beings who we experience as other' than us? Written by internationally acclaimed experts in the field, the "Core Text" offers an introduction and many challenges for further thinking and reading.