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To find the classification of individuals with intellectual disability, you can refer to recognized diagnostic manuals such as the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) or the International Classification of Diseases (ICD-10). These manuals provide criteria and guidelines for diagnosing intellectual disabilities and classifying them based on severity.

To access the information, you can follow these steps:

1. Search for the official website of the American Psychiatric Association (APA) if you are looking for the DSM-5, or the World Health Organization (WHO) website if you are looking for the ICD-10.
2. On the website, look for a section related to the diagnostic criteria or publications.
3. Locate the specific manual (DSM-5 or ICD-10) and navigate to the section on intellectual disability.
4. Within that section, you will find detailed descriptions of the various levels of intellectual disability, generally categorized as mild, moderate, severe, or profound based on standardized intelligence testing and adaptive functioning measures.
5. Each level may have its own criteria and characteristics, including limitations in intellectual functioning and deficits in adaptive functioning.

It is important to note that the process of diagnosis and classification should be done by trained professionals such as psychologists or psychiatrists, who can accurately assess and evaluate an individual's intellectual abilities and adaptive functioning.