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Believe it or not, the first attempt to gather information about mental health was done to collect statistical information for the 1840 census. In fact, it was these early census recordings that distinguished early categories of mental health. It was not until post-World War II that the first edition of the DSM or Diagnostic and Statistical Manual of Mental Disorders (DSM) was published. It was then this clinical and diagnostic tool, published by the American Psychiatric Association, provided description and diagnostic categories for clinicians working with mental disorders. Today, the DSM is still considered the authoritative guide by behavioral health professionals throughout the country, providing the common language and standard criteria for the classification of mental disorders.