Psychiatrists in Heidelberg on "Goals and Paths of Clinical Psychiatry," 1 he had been professor of psychiatry in Heidelberg since 1890, where he established a clinical research program to support the development of his new psychiatric nosologic classification. That year, the fifth edition of his textbook 2 was published containing a tentative diagnostic category of Verblödungsprocesse (dementing process). Three years later, the sixth edition of Kraepelin's textbook was published, containing the direct descendent of that category: dementia praecox (DP). [3][4][5] Kraepelin raised key issues about psychiatric nosologic classification: