A student with an Intellectual Disability (ID) has developmental delays in both adaptive and cognitive abilities that become evident between birth and the age of 18. There are four levels of intellectual disabilities: Mild (Mi), Moderate (Mo), Severe (S), and Profound (P). Students with intellectual disabilities have limitations in every day activities, including self-care, communication, learning, mobility, or the ability to work or live independently.
A student may be classified as having an intellectual disability when comprehensive developmental or educational assessments indicate deficits in both intellectual functioning and adaptive behavior (social, communication, self-care, learning, etc.).