Abstract
Classification is fundamental to the quantitative study of psychiatric phenomena. A valid classification system can be seen as a building block of diagnosis, assessment, intervention, and research. The two leading classification systems are the American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders (DSM) and the International Classification of Diseases (ICD). One of their major functions is communication across users. From a clinical perspective, they promote comparative analyses, systematic recording, cross-cultural analysis, and interpretation of data. From an educational perspective, they provide a means of delivering standardized training.
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