Abstract: A method for recording mass production work cycles of a facility. The facility having a machine and a replaceable mass production tool which is secured to the machine and is moved by the machine. According to the method, number sequences are formed that indicate how many cycles have been carried out by a specific tool in cooperation with a specific machine. The required detection of the cooperation of the particular tool with the particular machine is carried out on the basis of a comparison between the time curves of the values of two measured physical variables, wherein one physical variable is measured on the tool, and the second physical variable is measured on the machine, the two physical variables being such that the values thereof change cyclically with the rhythm of the work cycle carried out by the tool and the machine together.