To the reliability of an information-telecommunication system: an approach to recognition of reliable software characteristics

Issues of reliability assessment of newly created and existing information and telecommunication systems (ITS), traditionally routine and formal, are considered as an inalienable part of the design process. To determine the reliability of a system, the holistic methodology is proposed. Within the framework of this methodology, firstly, specific quantitative characteristics of reliability, which correspond to qualitative indicators determined at different stages of system development, are specified. For the hardware component, this is the availability factor, which is set by the standard indicators of trouble-free operation of the nodes. For software, this is a set of probability characteristics that take into account the specifics of different reliability indicators that characterize the quality of programs. Secondly, for determination of the chosen reliability characteristics, the relations based on the basic methods of mathematical statistics are given. Thirdly, to determine the probability characteristics, recommendations for collecting statistics at different stages of the life cycle of the system are given. The proposed methodology was used by the authors in a set of completed projects and proved to be effective.