In the following, two possible best-fit strategies are presented based on the example of a 2-D section. In the first case, the location of the points actually measured is optimized by minimizing the distances from the nominal points (Werth BestFit). Since the tolerances of various different object areas are not taken into consideration, under certain circumstances values exceeding the tolerance are determined even though the tolerance could be maintained by shifting the coordinate system.

This method is thus only marginally suitable for quality control. It is, however, often used to correct CAD data in order to improve the quality of the next production step. The optimization criterion of the second method (Werth ToleranceFit®) is to keep the distance between the measured point and the tolerance limit as large as possible or, if the measured point has already exceeded the tolerance limit, to keep the amount of the deviation from the tolerance limit as small as possible. A correct measurement is performed similarly to the way in which a plug gage is used. Figure 50 shows how an object which has been found to be defective according to the BestFit method (red areas present) but is not actually defective can be classified as functional according to the ToleranceFit® method.