The DSM (psychological book of diagnoses)has been revised in part because

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The DSM has been revised in part because beliefs about what is normal have changed over time. This can be seen in the inclusion of new disorders, the changing criteria for existing disorders, and the cultural context in which the disorders are diagnosed. While it is true that more mental illnesses are being discovered over time, this is not a primary reason for revising the DSM. Additionally, while the group creating the DSM is working to remove bias, this is not the primary reason for the revisions.

The DSM (Psychological Book of Diagnoses)has Been Revised in Part