ISO 230-2-2:2006 specifies methods for testing and evaluating the accuracy and repeatability of the positioning of numerically controlled machine tool axes by direct measurement of individual axes on the machine. These methods apply equally to linear and rotary axes. When several axes are simultaneously under test, the methods do not apply. ISO 230-2:2006 can be used for type testing, acceptance tests, comparison testing, periodic verification, machine compensation, etc. The methods involve repeat measurements at each position. The related parameters of the test are defined and calculated. Their uncertainties are estimated as described in of ISO/TR 230-9:2005, Annex C.