Intellectual Disabilities – DSM-5 Definition

 

This is a strong, accurate explanation already. I’ll gently refine and structure it so it’s clearer, more readable, and ready to drop straight into your book or training materials. I’ll also include an Easy Read version, as that’s something you regularly need.

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DSM-5 Definition of Intellectual Disability

(Intellectual Developmental Disorder)

The DSM-5 defines Intellectual Disability (ID)—also called Intellectual Developmental Disorder—as a neurodevelopmental condition that begins before the age of 18. It is characterised by significant limitations in both intellectual functioning and adaptive functioning, which affect a person’s ability to live independently.

Diagnosis is not based on IQ alone. Instead, it considers how a person thinks, learns, and manages everyday life within their cultural and social environment.

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Key Aspects of the DSM-5 Definition

1. Updated Terminology

The term “mental retardation” has been officially replaced with “intellectual disability (intellectual developmental disorder)” to reflect respectful, modern, and person-centred language.

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2. Three Main Diagnostic Criteria

A. Deficits in Intellectual Functioning

These include difficulties with:

• Reasoning

• Problem-solving

• Planning

• Abstract thinking

• Learning from experience

These deficits are confirmed through clinical assessment and standardised intelligence testing.
An IQ score of approximately 70 or below (around two standard deviations below the population average) is commonly used as a guideline—but IQ alone is not enough for diagnosis.

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B. Deficits in Adaptive Functioning

Adaptive functioning refers to how well a person manages everyday life and meets social and cultural expectations for independence.

Difficulties occur in one or more of the following domains:

• Conceptual
  (e.g. language, reading, writing, memory, understanding time or money)

• Social
  (e.g. communication, empathy, understanding social rules, forming relationships)

• Practical
  (e.g. personal care, daily routines, school or work tasks, managing responsibilities)

These difficulties must limit independence and reduce the ability to function without support.

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C. Developmental Onset

The intellectual and adaptive limitations must begin during childhood or adolescence, confirming that the condition is developmental, not acquired in adulthood.

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3. Severity Assessment

Severity is classified as Mild, Moderate, Severe, or Profound.

Importantly, the DSM-5 determines severity based on adaptive functioning, not IQ scores alone.
This approach helps identify the type and level of support a person needs in daily life.

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4. Focus on Everyday Life

The DSM-5 emphasises that intellectual disability is about how a person functions in real-world situations.
A person’s ability to manage social relationships, daily tasks, education, work, and independence is central to diagnosis and support planning.

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Easy Read Version

(Plain language – suitable for Easy Read materials)

What is Intellectual Disability?

Intellectual Disability is a condition that:

• Starts before age 18

• Affects learning, thinking, and daily life skills

It is not just about IQ.
It is about how a person cop es with everyday life.

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How Doctors Diagnose Intellectual Disability

Doctors look at three main things:

1. Learning and Thinking Skills

This includes problems with:

• Learning new things

• Understanding information

• Solving problems

An IQ test may be used, but IQ alone is not enough.

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2. Everyday Life Skills

Some people need support with:

• Communication and social skills

• Reading, writing, or money

• Personal care and daily routines

• School, work, or responsibilities

These skills are grouped into:

• Conceptual skills

• Social skills

• Practical skills

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3. When the Difficulties Started

The difficulties must have started:

• In childhood or teenage years

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Levels of Support

People may be described as having:

• Mild

• Moderate

• Severe

• Profound

This is based on how much support they need, not just test scores.

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Response 2

This is accurate and well-aligned with DSM-5, Sara 👍
If you’d like, here’s a cleaned-up, publication-ready version that tightens the language a bit and flows smoothly for textbooks, training, or awareness materials—while keeping the meaning exactly the same.

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DSM-5 Definition of Intellectual Disability

(Intellectual Developmental Disorder)

The DSM-5 defines Intellectual Disability (Intellectual Developmental Disorder) as a neurodevelopmental condition that begins before the age of 18 and is characterised by significant limitations in both intellectual functioning and adaptive functioning. These limitations affect a person’s ability to live independently and manage everyday life.

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Key Aspects of the DSM-5 Definition

Terminology Update
The DSM-5 officially replaced the outdated term “mental retardation” with “intellectual disability (intellectual developmental disorder)” to reflect more respectful, person-centred language.

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Three Core Diagnostic Criteria

1. Deficits in Intellectual Functioning
   These include difficulties with reasoning, problem-solving, planning, abstract thinking, judgement, academic learning, and learning from experience.
   Deficits are confirmed through clinical assessment and standardised IQ testing, with an IQ score typically around 70 or below (approximately two standard deviations below the population mean).

2. Deficits in Adaptive Functioning
   Adaptive functioning refers to how well a person meets developmental and sociocultural standards for independence and social responsibility.
   Difficulties occur in one or more of the following domains:

   • Conceptual: language, literacy, memory, time, number, and money concepts

   • Social: communication skills, empathy, social judgement, relationships

   • Practical: personal care, daily living skills, work tasks, and responsibility

   These limitations reduce independence and require ongoing support.

3. Developmental Onset
   The intellectual and adaptive limitations must begin during childhood or adolescence, confirming the condition is developmental rather than acquired later in life.

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Severity Classification

Severity is classified as Mild, Moderate, Severe, or Profound, based primarily on adaptive functioning, not IQ alone.
This approach helps determine the level of support a person needs in everyday life.

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Emphasis on Daily Life Functioning

The DSM-5 places strong emphasis on real-world functioning.
While IQ testing remains important, diagnosis focuses on how well a person can manage social, conceptual, and practical tasks in daily life, rather than relying solely on test scores.

1️⃣ Easy Read Version

(Plain language, short sentences – symbol-friendly)

Intellectual Disability

(Intellectual Developmental Disorder)

What is Intellectual Disability?

Intellectual Disability is a condition that starts in childhood.
It affects how a person learns, understands, and manages everyday life.

It is not caused by laziness or lack of effort.

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How Doctors Diagnose It (DSM-5)

Doctors use a guide called the DSM-5.

A person must meet all three of these:

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1. Difficulties with Learning and Thinking

This may include:

• Understanding information

• Solving problems

• Learning at school

• Remembering things

An IQ test may be used.
Usually, the score is around 70 or below.

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2. Difficulties with Daily Life Skills

These difficulties affect independence.

There are three areas:

Conceptual skills

• Reading and writing

• Numbers and money

• Understanding time

Social skills

• Talking to others

• Understanding feelings

• Making friends

Practical skills

• Personal care

• Using transport

• Work or daily tasks

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3. Starts Before Age 18

The difficulties must begin:

• In childhood

• Or during the teenage years

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Levels of Support Needed

Support needs can be:

• Mild

• Moderate

• Severe

• Profound

This is based on daily life skills, not just IQ.

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Important to Know

• IQ alone does not define a person

• Daily support needs matter most

• With the right support, people can live meaningful lives

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2️⃣ PowerPoint Slide Version

(Short, clear bullet points)

Slide 1 – Title

Intellectual Disability (DSM-5)
Intellectual Developmental Disorder

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Slide 2 – What Is It?

• A neurodevelopmental condition

• Starts before age 18

• Affects learning and daily living

• Lifelong, but support can help

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Slide 3 – DSM-5 Diagnosis

To diagnose Intellectual Disability, all three must be present:

• Intellectual difficulties

• Adaptive functioning difficulties

• Developmental onset

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Slide 4 – Intellectual Functioning

Includes difficulties with:

• Reasoning and problem-solving

• Learning at school

• Understanding information

IQ testing may be used
Typical score: around 70 or below

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Slide 5 – Adaptive Functioning

Difficulties in everyday life skills:

Conceptual

• Language, memory, maths

Social

• Communication, relationships

Practical

• Personal care, work, daily tasks

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Slide 6 – Severity Levels

Based on support needs, not just IQ:

• Mild

• Moderate

• Severe

• Profound

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Slide 7 – Key Message

• IQ is not everything

• Daily life skills matter most

• Support improves independence and wellbeing

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3️⃣ Short Student / Parent-Friendly Summary

Intellectual Disability is a condition that begins in childhood and affects learning and everyday life skills. According to the DSM-5, diagnosis is based on difficulties with thinking, problem-solving, and managing daily activities such as communication, social interaction, and personal care. Severity is decided by how much support a person needs in daily life, not just by IQ scores. With the right understanding and support, people with intellectual disabilities can live fulfilling and meaningful lives.

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Next steps (if you want 💡)

I can also:

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• Create a printable Easy Read PDF

• Build a full teaching module with activities

• Write a comparison section (ID vs learning disabilities like dyslexia)

• Adapt this for UK / US legal & education contexts

Just tell me what you’d like next 💛

rom the APA DSM-5-TR PDF:

• The diagnosis of intellectual developmental disorder (intellectual disability) is revised from the DSM-5 version.

• The term “intellectual developmental disorder” is used to align with the WHO’s ICD-11, with “intellectual disability” kept in parentheses for recognition and continuity.

• The DSM-5 text was updated to remove an inadvertently added fourth criterion related to adaptive functioning, clarifying that the criteria remain the three core ones.

• The text also clarifies that while an IQ of ~65–75 has historically been a reference range, the diagnosis shouldn’t be overly bound to that range, and it wouldn’t be appropriate for individuals with substantially higher IQ scores.

• References to this terminology were updated across other diagnostic criteria (e.g., autism spectrum disorder, language disorder).

📚 In context of the DSM-5 / DSM-5-TR overall criteria:

• The core three criteria — deficits in intellectual functioning, deficits in adaptive functioning, and onset during the developmental period — remain central.

• DSM-5-TR mainly refines wording and harmonises terminology with ICD-11 rather than restructuring core diagnostic requirements.

• IQ is not a stand-alone determinant, but standardized assessment remains part of evaluating intellectual functioning in context. 

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✅ VERSION 1: EASY READ

(Plain English, short sentences, symbol-friendly)

Intellectual Disability

(Intellectual Developmental Disorder – DSM-5-TR)

What is Intellectual Disability?

Intellectual Disability is a condition that:

• Starts before age 18

• Affects learning

• Affects everyday life skills

It is a developmental condition, not an illness.

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How Doctors Diagnose It

Doctors use a guide called the DSM-5-TR.

A person must have all three of these:

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1️⃣ Difficulties with Thinking and Learning

This can include:

• Understanding information

• Solving problems

• Learning at school

• Remembering things

Doctors may use an IQ test.
IQ is usually around 70 or below, but IQ alone is not enough.

---

2️⃣ Difficulties with Daily Life Skills

This affects independence.

There are three areas:

Conceptual skills

• Reading and writing

• Numbers and money

• Understanding time

Social skills

• Talking to people

• Understanding feelings

• Making friends

Practical skills

• Personal care

• Daily routines

• Work skills

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3️⃣ Starts in Childhood or Teenage Years

The difficulties must:

• Begin in childhood

• Or during the teen years

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Levels of Support

Support needs can be:

• Mild

• Moderate

• Severe

• Profound

This depends on daily life skills, not just IQ.

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Important to Remember

• The old term “mental retardation” is no longer used

• The correct term is Intellectual Developmental Disorder (Intellectual Disability)

• People can live full lives with the right support

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✅ VERSION 2: POWERPOINT SLIDE VERSION

(Short, clear bullets)

Slide 1 – Title

Intellectual Developmental Disorder
(Intellectual Disability – DSM-5-TR)

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Slide 2 – What Is It?

• A neurodevelopmental condition

• Starts before age 18

• Affects learning and independence

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Slide 3 – DSM-5-TR Diagnosis

All three must be present:

• Intellectual difficulties

• Adaptive functioning difficulties

• Developmental onset

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Slide 4 – Intellectual Functioning

Difficulties with:

• Reasoning

• Problem-solving

• Learning

IQ testing may be used
IQ usually around 70 or below
IQ is not the only factor

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Slide 5 – Adaptive Functioning

Difficulties in everyday life:

Conceptual – learning, memory, maths
Social – communication, relationships
Practical – personal care, work tasks

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Slide 6 – Severity Levels

Based on support needs:

• Mild

• Moderate

• Severe

• Profound

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Slide 7 – DSM-5-TR Updates

• Name updated to match ICD-11

• No extra diagnostic criteria

• IQ cut-offs are flexible

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Slide 8 – Key Message

• Focus on real-life skills

• Support improves independence

• Respectful language matters

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✅ VERSION 3: DSM-5 vs DSM-5-TR COMPARISON TABLE

Area	DSM-5	DSM-5-TR
Name	Intellectual Disability	Intellectual Developmental Disorder (Intellectual Disability)
Old terminology	Removed	Still removed
Core criteria	3 criteria	Same 3 criteria
IQ role	Important	Important but not fixed
Severity	Based on adaptive skills	Same
Alignment	DSM only	Aligned with ICD-11
Clarifications	Some confusion	Clarified wording

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✅ VERSION 4: STUDENT / PARENT-FRIENDLY SUMMARY

Intellectual Developmental Disorder (Intellectual Disability) is a condition that begins in childhood and affects learning and everyday life skills. Diagnosis is based on difficulties with thinking, problem-solving, and managing daily tasks such as communication, relationships, and personal care. The DSM-5-TR places more importance on how a person functions in daily life than on IQ scores alone. Support needs are described as mild, moderate, severe, or profound, depending on independence and support required.

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✅ VERSION 5: TEACHING / TRAINING NOTES (PROFESSIONAL)

• DSM-5-TR aligns terminology with ICD-11

• Diagnosis remains based on three criteria only

• IQ scores guide assessment, but are not absolute cut-offs

• Severity is defined by adaptive functioning

• Language updates improve clarity and reduce stigma

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