International Journal of Advanced Research in Computer Science and Software Engineering (IJARCSSE)
Most of the researches in classical reliability theory are based on binary state assumption for states. Such systems may be considered working to certain degrees at different states of its degradation during its transition from fully working state to completely failed state. Fuzzy set theory has been studied extensively over the past thirty years. In general fuzzy sets are used to analyze the system reliability. In this paper, the authors present a new method for analyzing fuzzy reliability of series and parallel network systems based on vague set theory, where the reliabilities of components of a system are represented by vague sets defined in the universe of discourse.