N.O. DEMIDOVICH’S SEQUENTIAL CONTROL METHOD

Abstract

Our late colleague Nikolai Olegovich Demidovich developed and gave us a great method of sequential control of dependability (and other similar properties of products) that is significantly superior to the “classic” Wald’s method (featured in all textbooks). Not many people can now recognize Demidovich’s method in GOST R 27.402-95 and IEC 61124. His first articles date back to the 1960s. The method that uses computers and formulas allows choosing the sequential control boundaries that ensure the accuracy of specified risks values. N.O. Demidovich’s boundaries can create indecision regions of any shape (including closed ones) and do not require truncation. The purpose of this article is to reestablish N.O. Demidovich’s (and Russia’s) priority in sequential control and replace Wald’s method (paying the latter the well-deserved tribute of course).