Abstract: The invention, that relates to a machine diagnosis system for the state-oriented operation monitoring of a machine, comprises a characteristic value module and a cause module. The characteristic value module, proceeding from machine-state referred measurement values, establishes diagnosis-relevant characteristic values, and the cause module diagnoses from the characteristic values a cause for the detected measurement values. There the cause module calculates for at least one possible cause in each case a cause probability which indicates with what probability the corresponding cause is responsible for the presence of the detected oscillation measurement values.