Intellectual and Developmental Disabilities

Developmental Disability

  • Developmental Disability (DD) is a severe mental or physical impairment or combination of mental and physical impairments

  • Begins before an individual is 22 years of age or 18 years of age for an intellectual disability;

  • Begins in and directly affects the brain and has continued, or is expected to continue, indefinitely;

  • Causes significant impairment of daily living skills (adaptive behavior) such as, but not limited to, communicating, grooming, dressing, safety and social skills.

Other developmental disabilities include autism, cerebral palsy, epilepsy, or other neurological disabling conditions.

See the full definition of Developmental Disability in OAR 411-320-0020.    

Intellectual Disability

  • Intellectual Disability (ID) means significantly sub-average intellectual functioning with an intelligence quotient (IQ) of 70 and under as measured by a qualified professional, along with a lack of daily living skills (adaptive behavior) such as, but not limited to, communicating, grooming, dressing, safety and social skills, that show up prior to 18 years of age.

  • Individuals with IQ's  of 71-75 may be considered to have an intellectual disability if there is also significant impairment in adaptive behavior as diagnosed by a licensed clinical or school psychologist.

See the full definition of Intellectual Disability in OAR 411-320-0020.