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AbstractÐPoint availability and expected interval availability are dependability measures respectively defined by the probability that a system is in operation at a given instant and by the mean percentage of time during which a system is in operation over a finite observation period. We consider a repairable computer system and we assume, as usual, that the system is modeled by a finite Markov process. We propose in this paper a new algorithm to compute these two availability measures. Thisdoi:10.1109/12.811102 fatcat:ivey7y367ffsdgvsekq5xde3gq