![]() Nevertheless, the classification system was revised again to include the four levels of ID (mild, moderate, sever and profound) which are based not on IQ, but on adaptive behavior skills. According to the DSM-5, the intellectual deficit of individuals with ID is largely manifested in a lack of understanding, reasoning, problem-solving, planning, abstract thinking, learning from experience and academic learning (, pp.33). The definition of ID in the DSM-5 is similar to that of the AAIDD from 2002. The 20 American Association of Intellectual and Developmental Disability (AAIDD) classification manuals suggested four levels of support (intermittent, limited, extensive, pervasive) as an alternative to the four IQ levels however, these levels were not intended to form a classification system in the same way as the four levels of mental retardation (mild, moderate, severe, profound) and therefore the traditional classification system is still in use. Intellectual disability is characterized by significant limitations in both intellectual functioning and in adaptive behavior including conceptual, social, and practical adaptive skills. The traditional definition of mental retardation of the American Association of Mental Retardation has been replaced by a new one defined by the American Association of Intellectual and Developmental Disability and by the Individuals with Disabilities Education Act. In 2010, according to the Rosa’s Law and the US federal law (Rosa’s Law), the term "Intellectual disability" was confirmed as an alternative to "mental retardation". ![]() ![]() The most common classification scheme involved grouping people based on IQ into one of four subgroups: mild (IQ from 55–75), moderate (IQ from 40 to 55), severe (IQ from 25 to 40) and profound (IQ below 25). Traditionally, classification systems of the mental retardation (MR) revolved primarily around the range of IQ scores achieved by people who met the criteria of an IQ score two or more standard deviations (IQ 70–75) below the mean. ![]()
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