This brief timeline lays out major events relating to the DSM I and some relevant historical events:

  • 1840: US census bureau develops first psychological classification system which distinguishes between “idiocy” and “insanity”
  • 1880: system expanded to include 7 diagnoses
  • 1883: Kraeplin publishes the textbook Compendium of Psychiatry, which included clinical examples and terminology
  • 1933: American Psychiatric Association developed its own system
  • 1952: American Psychiatric Association publishes the DSM-I
  • Following WWII, patient populations inspired changes by illuminating the need for newer, more concise methods of diagnoses and a greater number of diagnostic possibilities.

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