There has been an increased awareness in the diagnosis of mental disorders in people with intellectual disability (ID). The evidence base has demonstrated that people with ID can display the same mental disorders as the general population and that the prevalence of such disorders varies according to the methods used for their assessment and diagnosis. The diagnosis of mental disorders in people with ID is a highly complex process mostly because of the difficulty or inability of some people with ID to express their feelings and symptoms. Hence, many of the diagnostic criteria for mental disorders used in the general population needed to be modified and adapted for people with ID.

The National Association for Persons with Developmental Disabilities and Mental Health Needs (NADD) has been among the leading organizations in the U.S. and internationally in providing educational and training programs, support for research projects, and publicizing important...

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