Abstract:
The levels of severity of intellectual disability are no longer defined by IQ scores only. Intellectual disability has historically been defined as significant intellectual impairment as measured by an IQ of under 70 (Hellenbach et al., 2017) together with impaired adaptive behaviour or social functioning (McBrien, 2003). The different degrees of intellectual disability, such as mild, moderate, severe and profound, are defined on the basis of adaptive functioning because it is adaptive functioning that determines the level of support necessitated (APA, 2013).