Description: The article describes an issue of quality control of metals in military production. Reflected the usefulness of the theory of precedents for metallographic analysis. The method for determining grade metal in accordance with existing standards based on the theory of precedents is developed that will automate the process identify a brand of metal. The scheme of the functioning of the precedent of the expert system is described.
Keywords: precedent method, the utility function, the chemical composition of metal, metal stamp