Kraepelin proposed that by studying case histories and identifying specific disorders, the progression of mental illness could be predicted, after taking into account individual differences in personality and patient age at the onset of disease.
Kraepelin cría que estudando historias de casos e identificando as desordes, podería chegar a predicir a evolución dunha enfermidade mental, tendo en conta tamén as diferenzas individuais da personalidade e as idades dos pacientes no inicio das enfermidades.