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.