 In 1894 Dilthey published his “Ideas for a Descriptive and Analytic Psychology” and established how it differs from traditional explanative psychologies. He admits that even a descriptive psychology will seek to explicate the causal relationships of life, but that it must differ from explanative psychology by not trying to “derive a comprehensive and transparent cognition of psychological phenomena from a limited number of univocally determined elements” (1894/SW.II, 116). Unlike the associationists, Dilthey will not posit simple, stable impressions that are then combined into more complex ideas. They introduce unnecessary hypothetical elements into the foundation of psychology. 