The current issue of the DSM is the DSM-IV-TR, in other words, the Diagnostic And Statistical Manual Of Mental Disorders, Fourth Edition, Text Revision. The first edition of the DSM was published in 1952. The DSM-II was published in 1968. The DSM-III came out in 1980, and a revised version, the DSM-III-R came out in 1987. In 1994 the DSM-IV was published and the DSM-IV-TR came out in the year 2000.
Since it is difficult to define objective criteria for what a mental disorder is, the contents of the DSM are the result of a majority vote of the APA. This has led to some interesting and abrupt changes in the content of the DSM over the years. Until 1973 homosexuality was a mental disorder according to the DSM. In 1973 the APA voted that homosexuality was no longer a mental illness.