As an expert in the field of psychology and human development, I would like to clarify that the term "mental retardation" has been outdated and is now considered offensive. The current clinical term is "intellectual disability" (ID). The classification of intellectual disability is based on both the individual's intelligence quotient (IQ) and their adaptive behavior skills.

According to the **American Association on Intellectual and Developmental Disabilities (AAIDD)**, the IQ range for an individual to be classified with an intellectual disability is approximately 70 or below. However, it's important to note that IQ is just one aspect of the assessment. The individual must also have significant limitations in two or more adaptive skill areas, which can include communication, self-care, academic skills, work, leisure, and social skills.

It's also crucial to understand that IQ tests are not a perfect measure of a person's intellectual capabilities. They are standardized tests that can be influenced by various factors, including the individual's environment, culture, and test-taking conditions.

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Mental deficiency used to be divided into the following sub-classifications, but these labels began to be abused by the public and are now largely obsolete: Borderline Deficiency (IQ 70-80), Moron (IQ 50-69), Imbecile (IQ 20-49) and Idiot (below 20). Mental deficiency is now generally called mental retardation.read more >>