An intellectual disabilities (ID) were a developmental impairment that results in cognitive ability and adaptive functioning that are substandard to a significant degree. More specifically, ID is defined by a combination of three factors:

• Deficits in intellectual functioning confirmed by both clinical assessment and individualized standardized intelligence testing.

• Deficits in adaptive functioning in one or more of the following adaptive skills areas:

  • Communication

  • Social participation

  • Independent living

• Onset during the developmental period.