The Diagnostic and Statistical Manual of Mental Disorders (DSM), is the standard classification of mental disorders used by mental health professionals in the United States. It is published by the American Psychiatric Association. The DSM contains a listing of psychiatric disorders and their corresponding diagnostic codes. Each disorder included in the manual is accompanied by a set of diagnostic criteria and text containing information about the disorder. It does not generally speculate on casuality or focus on treatment.
The first edition of the DSM was published in 1952. Subsequent revisions included DSM-II, (published in 1968), DSM-III (published in 1980), DSM-III-R (published in 1987), and DSM-IV (published in 1994). The current version of the DSM, called the DSM Fourth Edition, Text Revision (DSM-IV-TR), was published in 2000. The next edition of the DSM -- DSM-V -- is expected to be published in 2012.

