This is the third in a series of perspective articles (Schalock et al., 2007; Wehmeyer et al., 2008) from the Terminology and Classification Committee of the American Association on Intellectual and Developmental Disabilities (AAIDD). The purpose of these articles is to share our thoughts on critical issues associated with terminology, definition, and classification in the field of intellectual disability and to seek input from the field as we prepare the 11th edition of AAIDD's Diagnosis, Classification, and System of Supports Manual (the working title). In the first article (Schalock et al., 2007), we explained the reasons for shifting from the term mental retardation to intellectual disability. Although the two terms cover the same population of individuals, we concluded that intellectual disability was the better term because it

In the second article (Wehmeyer et al., 2008...

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