This part of ISO 230 specifies test procedures to evaluate the measuring performance of contacting probing systems – used in a discrete-point probing mode – integrated with a numerically controlled machine tool. It does not include other types of probing systems such as those used in scanning mode or non-contacting probing systems. The evaluation of the performance of the machine tool used as a Coordinate MeasuringMachine (CMM) is outside the scope of this part of ISO 230. Such performance involves traceability issues, is strongly influenced by machine tool geometric accuracy and shall, in addition to the machine tool probing system tests specified in this