The SAGE Encyclopedia of Intellectual and Developmental Disorders

According to the CDC "about one in six, or about 15%, of children aged 3 through 17 years have one or more developmental disabilities," such as ADHD, autism spectrum disorders, cerebral palsy, intellectual disability, and learning disability.

Intellectual disorders are characterized by significant limitations in both intellectual functioning and in adaptive behavior, which covers many everyday social and practical skills, impacting learning, reasoning, problem solving, and other cognitive...