The study presented examines the predictability of current characteristics of endogenous psychoses by features of the individual course of the illness. Endogenous psychoses were represented by samples of n=27 subjects each of patient groups suffering from schizophrenia, bipolar schizoaffective disorders and bipolar mood disorders. Features of the individual course of the illness were assessed as well as current characteristics in terms of mood and psychotic symptoms, cognition, level of functioning, and quality of life. Results showed that in prediction of all current characteristics categorial diagnosis explained less variance (0%-10%) than features of the individual course of the illness (13-46%). These results demand a stronger consideration of clinical course besides the categorial diagnosis in decisions for therapy and prognosis.