DSM-III

This category should be used when there is more than one Specific Developmental Disorder, but none is predominant. It is common for a delay in the development of one skill (e.g., reading, arithmetic, or language) to be associated with delays in other skills. The Mixed Specific Developmental Disorder category should be used when the mixture of delayed skills is such that all skills are impaired to relatively the same degree. With the skills are impaired to varying degrees, multiple diagnoses should be recorded, the skill most seriously impaired being recorded first.

DSM-IV

See Learning Disorders and Communication Disorders

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