Specific developmental disorders (SDD) was a classification of disorders characterized by delayed development in one specific area or areas.
[1][2][3][4] Specific developmental disorders were contrasted to pervasive developmental disorders[4] which were characterized by delays in the development of multiple basic functions including socialization and communication.
[5] The tenth revision of the International Statistical Classification of Diseases and Related Health Problems (ICD-10) has four categories of developmental disorders: specific developmental disorders of speech and language, specific developmental disorders of scholastic skills, specific developmental disorder of motor function, and mixed specific developmental disorder.
[2][6] In the third edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III),[7] SDD was opposed to the pervasive developmental disorders (PDD).
There were two factors that were considered: In the DSM-IV, specific developmental disorders were no longer grouped together.