The American Association on Intellectual and Developmental Disabilities defines intellectual disability (ID) as the following:
- Substantial limitations in intellectual functioning
- Significantly limitations in adaptive behavior consisting of conceptual, social, and practical skills;
- Originating before age 18 ( AAIDD, 2008)
- Intellectual disability is concerned with IQ measures, intellectual functioning, language development and social behavior.
The severity of ID has been summed up in the following table:
|% of MR
|Usually live and work independently within regular community. Often have families.
|Capable of some semi-independence at work and in residence. As adults, many work in supportive environments and live with relatives or in community residences.
|Capable of learning some self care skills and are not totally dependent. Some adults are able to work in supportive environment and live with relatives or community residences.
|19 and below
|Capable of learning some basic living skills but will require continual care and supervision. Often exhibit multiple handicap