Santé Montréal

Intellectual disability (ID)

Click to close accordion

Click to open accordion


What is an intellectual disability1?

The person who has an intellectual disability has significant intellectual functioning limitations (reasoning, planning, problem resolution, abstract thought, understanding complex ideas, learning by experience, memorization, attention).

This person also has significant adaptive behaviour limitations, that is the whole conceptual, social and practical skills learned by the person so that they can function on a daily basis.

Intellectual disability appears during the development period and implies deficits both on the intellectual and the ability to adapt in daily life.

To decide on an intellectual disability, three criteria must be present :

  • intellectual deficit
  • adaptative skills deficit
  • and difficulty starting during the development period.

(1) Taken from Intellectual Disability: Definition, Classification, And Systems of Support (2011) and DSM-5, American Psychiatric Association

Page's top


Page's top

When to Consult

Page's top


Page's top

Protection and prevention

Page's top

Risk factors

Page's top

Help and Resources

Access Guichet DI-TSA-DP

The ID-ASD-PD Access Desk receives and processes applications for CLSC services and rehabilitation services for clients with intellectual disabilities (ID), autism spectrum disorders (ASD) or physical disabilities (PD).

For more information or services request, visit :

- ID-ASD-PD Access.

Page's top


Page's top

People at Risk

Page's top

Dernière mise à jour le : 2018.04.19