The article describes the problem of aggregated evaluations of systems quality state. The evaluation takes into account the presence of key components in the system (subsystems, functional elements). Key components are those parts of the subsystem, failure of which leads to the failure of the subsystem or system as a whole. The proposed method allows for key components assertion based on their role in the system, and to make aggregated evaluations considering their role. The proposed method is based on the logic-axiological approach to evaluation. The named approach states that intersystem dependencies between components (i.e. the hierarchy) are defined with a set of productions ¬→¬ cc ′ , where a functional element, subsystem or system as a whole can serve as c′. Verity of such production belongs to an interval [0, 1] and characterizes the losses of c′ in case the c is lost. It is being considered as value of c for c′. The evaluation is a fuzzy conclusion on a knowledge base that consists of described productions. The peculiarity of the method is the possibility to consider both hierarchical and other types of interconnection in the system.
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