Some Issues of Application of Quality Characteristics for Critical Information Infrastructure Systems

To assess the quality of critical information infrastructure systems throughout the entire life cycle, quantitative assessments of the quality of the software / digital system are required. The article presents quality models in use and quality models of a software / digital system and a diagram of threats to the quality of software / digital systems and methods for their prevention. The quality model of a software / digital system considers in detail the allocation of a 3-level structure (factor, criterion, metric). Recommendations are given on using evaluation characteristics for different life cycle stages, a structural-functional model of quality assessment present. The presented approach is used to assess software quality for critical information infrastructure systems (nuclear power facilities, transport infrastructure, etc.).