Development stage inclusion in school children with autistic spectrum disorders (ASD) special educational needs should be valued according to the particularities of autistic disorder and in particular the development of intellectual sphere. The article deals with the link between ASD and mental disability. It reflected the evolution and structure links between ASD and mental disability, acetic variety analyzed various qualitative characteristic of this connection and the specificity of intellectual development evaluation for ASD. There are proposed some recommendations on evaluating intellectual development to avoid some mistakes in choosing the educational model.