Basic definitions -- 3

Coverage -- a measure of the capability of a system to tolerate the occurrence of a fault and defined as the conditional probability that the system will recover given that a fault has occurred

Mean-time-to-failure (MTTF) -- the expected value of the time to failure of a system

Coverage -- a measure of the capability of a system to tolerate the occurrence of a fault and defined as the conditional probability that the system will recover given that a fault has occurred