DANSK DS/ISO 25337 PDF

This International Standard establishes a statistical, so-called, single determination model (SD-Model) for applying single measurements for production quality control purposes within a producer's manufacturing site, even if a standard test method prescribes a more-fold determination. The statistical method is also applicable to test methods prescribing repeated handlings. A general approach on the precision statement in standards, which produce numerical results, is described in this International Standard. This statistical method is only applicable to so-called normal distributions of measurement data. The principle of the statistical method is based on the determination of production limits, including the accuracy of the test method, and the reproducibility of the test method, where the latter is added to the production limits in order to define an area outside the defined production limits were a measurement result can be caused by the production process and/or the test method itself. When specified by the responsible authority this International Standard shall be referenced in a product or process specification, contract, inspection instructions, or other documents and the provisions set forth therein shall govern. The "responsible authority" shall be designated in one of the above documents. The SD-method is designed for project managers, chiefs of laboratories and production mangers. However, the support of a statistician is highly recommended, or sometimes indispensable, for providing the necessary technical backup and statistical analysis.