The book presents the basic concepts and parameters of the structural reliability of information systems’. It discusses general and specific differences in reliability indices used in domestic and international standards, along with recent developments in approaches to reliability modeling. Markov reliability models together with graph semi-Markov methods for calculating reliability are described in detail and illustrated by numerous examples. Considerable attention is paid to the engineering methods of calculation and the approximate prediction of the structural reliability and error estimation of information systems as well as to the statistical assessment of reliability parameters. At the end of each chapter there are checklists for the most complex and significant content of the chapter.
   The book is intended primarily for professionals involved in practical work on the development, production, operation and modification of information systems. It is designed for scientists in the field of structural reliability of various discrete systems, academic staff and graduates (students) specializing in information systems as well as in the field of automated control systems.

   This book presents the theory of functional reliability of information systems as a component of general reliability theory for the first time. The book reprises basic concepts and definitions, including threats to functional reliability violations of information systems, system parameters, methods of estimation of the functional reliability of digital devices and methods and models of software functional reliability estimation. The functional reliability of crucial information systems, including the concept of crucial system, feature of faulty errors, estimation of functional reliability of operators, estimation of dangerous failures and risks, the requirements of functional reliability and the software architecture of the crucial information systems, are considered in a separate chapter.
   A checklist on the most complex and significant subjects are provided at the end of each chapter. The book is primarily intended for experts who are engaged in practical work on the development, manufacture, operation and updating of information technologies and information systems. It is intended for science officers in the field of software-hardware of information systems, academic staff, post-graduate students and students specializing in the field of information technologies as well as those working in the field of automated control systems.
      The book presents the theory of the functional reliability of information systems as a component of the general theory of reliability. It includes concepts and definitions including the basic threats of violation of information system functional reliability, system parameters, methods of functional reliability estimation of digital devices, methods and models of software functional reliability estimation. The functional reliability of crucial information systems, including the concept of crucial systems, the feature of faulty errors, the estimation of the functional reliability of operators, the estimation of dangerous failures and risks, the requirements of functional reliability and the software architecture of the crucial information systems are considered in the separate chapter.

    The book describes conceptual provisions to ensure structural and functional reliability of information systems at all stages of a life-cycle. It represents different types of redundancy taking into account limited efficiency of the failure detection system. Under these conditions a broadbased assessment of their efficiency is performed, with determination of capabilities of structural redundancy with an endless number of standby facilities. Ways to ensure functional reliability of software are represented, including the recommendations for the development of software programs requirement specification, with the description of the process of a reliable program architecture development and well proven rules and recommendations used for design and implementation of software, as well as for integration with system hardware.
    The book also presents theoretical and practical provisions of adaptive fault tolerance (active protection) of information systems, including the methods and disciplines of active protection, as well as the waysofimplementation. Amethod of synthesis of active protection and the results of research of information system reliability with various disciplines of active protection are offered. There are also certain assessments of the efficiency of active protection in relation to the traditional methods of structural redundancy.
      You can find the description of the principles to ensure functional safety of information systems, with a substantiation of the possibility to restart independent channels in two-channel safe systems. The rules of determination of the allowed timeforaguaranteed detection of single and double hazardous failures are developed, including the method of synthesis of a combined two-level information system developed with higher functional safety requirements.
      To prove the conformance of reliability with functional safety the method of accelerated field testing of the information system has been developed. The book containsthe description of this method, including the example of its practical implementation. You will also find the information about the procedures of certificationtests based on the requirements of information safety and software certification conformance.
      A checklist of the most complex and significant subjects is provided at the end of each chapter. The book is primarily intended for experts who are engaged in practical development, manufacture, operation and updating of information. It is intended for researchers in the field of structural reliability of different discrete systems, academic staff, post-graduate students and students specializing in the field of information systems and as well as those working in the field of automated control systems.

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