This is a comprehensive and clearly set out introduction to intellectual disability which shows how lack of knowledge and segregation of people with an intellectual disability have shaped many negative community attitudes towards people with an intellectual disability. The book gives a historical perspective of intellectual disability in Australia (including legislation) and describes the new principles and attitudes which are contributing to the acceptance of people with a disability as valued members of the community. Also included are sections on approaches to defining intellectual disability and the causes of intellectual disability, together with a chapter on determining the number of people with a disability in a community. Keyword: Theory