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This part of ISO 10360 specifies a method for testing software used for computing associated features from coordinate measurements. The features of concern are the line (in two and three dimensions), the plane, the circle (in two and three dimensions), the sphere, the cylinder, the cone and the torus. One or more separate tests are required for each feature claimed to be covered by the software. The test is of the software alone and therefore independent of the coordinate measuring system. NOTE 1 If the result of the test indicates that the performance values for linear size parameters of the associated feature are significant compared with the error of indication of a CMM for size measurement (see ISO 10360-2), as provided by the CMM manufacturer, the software is inadequate for application on that measuring system. However, small performance values, obtained as a result of this test, do not provide complete assurance that the software is totally suitable for computing associated features. This part of ISO 10360 is concerned with complete features and non-extremely partial features; however, the test for complete features and that for partial features are separate, and software may be submitted for either or both tests. Cones with very large apex angles are not covered by the test. NOTE 2 Associated cones with very large angles are unusual in practice and the software for their stable computation is not widely available.