This standard applies to provide a classification process used to characterize the basic knowledge of mathematics. It is not only suitable for particle size analysis, the same can also be used to characterize the classification process (such as: air classification, centrifugal classification) or a separate process (such as: cyclone or hydrocyclone). In Chapter 3, the classification process is based on the characterization of the raw material and the thickness of the component description of the frequency distribution curve and overall balance of quality under the premise of no errors. In Chapter 4 describes the systematic errors on the classification efficiency. Discussed in Appendix A random errors influence on the classification process characterization.