A Systematic Approach to Subgroup Classification in Intellectual Disability.

This article describes a systematic approach to subgroup classification based on a classification framework and sequential steps involved in the subgrouping process. The sequential steps are stating the purpose of the classification, identifying the classification elements, using relevant information, and using clearly stated and purposeful subgroup classification terms. This systematic approach reflects current changes in the field of intellectual disability (ID), the modern and social understanding of ID, and the multiple purposes for classification.