other classification systems. Moreover, a federal statute in the United States (Public Law
111-256, Rosa’s Law) replaces the term mental retardation with intellectual disability,  and
research journals use the term intellectual disability. Thus, intellectual disability  is the
term in common use by medical, educational, and other professions and by the lay public
and advocacy groups.
Specify current severity (see Table 1): 
317 (F70)    Mild
318.0 (F71) Moderate
318.1 (F72) Severe
318.2 (F73) Profound
Specifiers
The various levels of severity are defined on the basis of adaptive functioning, and not IQ
scores, because it is adaptive  functioning that determines the level of supports required.
Moreover, IQ measures ar e less valid in the lower end of the IQ range.