Abstract: The invention relates to a method of monitoring a mechanical seal arrangement (1) comprising the steps of: acquiring operational data of an individual mechanical seal arrangement (1) on a test bench (11), the acquired operational data being defined as the nominal data (17), incorporating the individual mechanical seal arrangement (1) into a sealing system (12), acquiring operational data from the individual mechanical seal arrangement (1) in the condition incorporated into the sealing system (12), the acquired operational data being defined as the actual data (18), and comparing the nominal data (17) with the actual data (18).