Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Audit and Monitoring of the State of Informatization Objects in the Process of Designing Complex Information Protection Systems for Significant Objects of Critical Information Infrastructure M.YU. RYTOV, N.O. MUSIENKO, YU.A. GUBSKOV, YU.V. MININ A model has been developed for assessing the security of information and information security of a critical information infrastructure object under the conditions of impact, based on the methodology of structural analysis and design, characterized by taking into account a comprehensive understanding of the properties, parameters and other characteristics of the critical information infrastructure object, in the context of information security. A methodology has been developed to ensure internal audit and monitoring of the state of an object under the influence of threats to its information security, based on modeling threats to the security of information of an object of critical information infrastructure based on expert assessment methods and characterized by a reduction in the level of subjectivity and uncertainty in determining the scenario of violators' actions. Keywords: Critical information infrastructure, categorization, critical information infrastructure object, information security audit, information security monitoring, information security system. DOI: 10.25791/pribor.10.2022.1364 Pp. 10-18.