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Reliability,Availability,Maintainability

Reliability: the probability of software operating without failure under given conditions for a given time interval T.

R = MTTF/(T+MTTF)

Availability: the probability of software operating without failure at a given moment in time.

MT(Between Failures) = MT(To Failure)+MT(To Repair)

A = MTBF/(T+MTTF)

Maintainability: the probability of successful software maintenance operation being performed within a stated interval of time.

M = T/(T+MTTR)

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