Abstract:
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.
Keywords:information and telecommunication systems; system design; reliability; probability
reliability characteristics.