An approach of system reliability analysis using failure possibility and success possibility

The presented approach is based on the following consideration. (1) Linguistic terms are more commensurate with expressions of (un)reliability when we have not enough amount of data to express (un)reliability by numerical terms. (2) Analyst´s subjectivity should be incorporated into the system reliability analysis since the subjectivity is found in the analysis. This paper mentions the subjective unreliability measure and the subjective reliability measure and the relationship among them. The relationship reflects analyst´s subjectivity well. The approach includes the AND operation and the OR operation of subjective measures, the dependence model, and natural language expressions of system (un)reliability. Especially in the dependence model two kinds of dependences, i.e., failure dependence and success dependence, which are found in machine system and human task, are considered. Finally this paper gives an example of the system reliability analysis in order to show the usefulness and the feasibility of the approach