Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Problem of finding the negative external effectsevery type on the information systemsthat maximize the value of the damage Y.Y. GROMOV Y.V. MININY.F. MARTEMYANOVV.E. DIDRIHP.A. SHERBININ This paper is devoted to the choice of means of countering external influences set against negative external influences acting on the information system so that the sustainability of the latter was the highest. The paper presents the formulation and algorithm for finding the negative external effects of each type in the information systems that maximize the value of the damage. Keywords: information system, the negative external effects, the probability. Contacts: E-mail: gromovtambov@yandex.ru Pp. 40-44.