As a psychologist with a focus on cognitive development and intellectual disabilities, I frequently encounter questions regarding the classification of intellectual functioning and its relationship to IQ scores. It's important to approach this subject with sensitivity and a thorough understanding of the current diagnostic criteria and terminology.
The concept of "mental retardation" has evolved significantly over the years, and the terminology has changed to reflect a more respectful and person-centered approach. The term "intellectual disability" is now widely used in place of "mental retardation." It's crucial to use the current and respectful terminology when discussing these conditions.
When it comes to IQ scores and their classification, the American Association on Intellectual and Developmental Disabilities (AAIDD) and other professional organizations have established guidelines. These guidelines categorize levels of intellectual functioning based on IQ scores and adaptive behavior. It's important to note that an IQ score is just one aspect of the diagnostic process and must be considered alongside adaptive behavior skills.
According to the AAIDD, the classification of intellectual disability is as follows:
- **Borderline Intellectual Functioning (IQ 71-84)**: Individuals in this category may experience some challenges in learning and social situations but are generally able to function independently.
- Mild Intellectual Disability (IQ 50-70): Those with mild intellectual disability may require support in various aspects of life, including education, social skills, and employment.
- **Moderate Intellectual Disability (IQ 35-40 to 50-55)**: Individuals with this level of disability often need significant support and may have limited communication and self-care abilities.
- **Severe Intellectual Disability (IQ 20-25 to 35-40)**: This category includes individuals who need extensive support due to severe limitations in intellectual functioning and adaptive behavior.
- **Profound Intellectual Disability (IQ below 20 or 25)**: The most severe level, where individuals require pervasive support and have very limited or no functional language.
The classification provided in the question seems to be outdated and may not align with the current standards. It's also worth noting that the term "mental retardation" is now considered outdated and offensive. The term "intellectual disability" is preferred and is used in line with the most recent diagnostic criteria from the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) and the International Classification of Diseases (ICD-11).
When discussing IQ scores in relation to intellectual disability, it's essential to consider the context and the individual's overall adaptive functioning. An IQ score alone does not provide a complete picture of a person's abilities or needs. A comprehensive assessment that includes adaptive behavior, educational performance, and daily living skills is necessary for an accurate diagnosis.
In conclusion, while an IQ score can be a part of the diagnostic process, it's important to approach the topic with sensitivity and to use current, respectful terminology. The classification of intellectual disability is complex and should be based on a thorough evaluation that goes beyond a single test score.

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IQ ClassificationsV62.89Borderline Intellectual FunctioningIQ 71-84317Mild Mental RetardationIQ 50-55 to approximately 70318.0Moderate RetardationIQ 35-40 to 50-55318.1Severe Mental RetardationIQ 20-25 to 35-40318.2Profound Mental RetardationIQ below 20 or 25read more >>