M. : Metallurgy, 1984. — 119 s. : il. A universal method of reducing to a dimensionless form both equations and a set of quantities characterizing a physical system is considered. Rules for assessing the significance of similarity criteria are set out, as well as rules for bringing the criteria system to a rational form under approximate modeling. Specific examples of approximate modeling of some processes of metallurgical production are given. Designed for engineering and scientific workers; both engaged in physical modeling, and for the first time mastering this method of research.