a combination of two or more developmental defects, And it’s not just the sum of the flaws, But it is qualitatively unique and has a special structure that differs from its components. Children with intellectual disability are a special category of abnormal children, A distinction is made between the following groups: Mentally retarded, blind and visually impaired; Deaf and visually impaired. Deaf-blind; deaf and hard of hearing with musculoskeletal disorders, and so on. The set of defects distorts the development of such children to a much greater extent than abnormal children of other categories. They are trained and educated in special facilities. Educational institutions, They are sent on the basis of a conclusion about the seriousness of a particular defect.