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== MTBF and MTTF ==
[[MTBF]] (mean operating time between failures) applies to equipment that is going to be repaired and returned to service, [[MTTF]] (mean time to failure) applies to parts that will be thrown away on failing. During the ‘useful life period’ assuming a constant failure rate, MTBF is the inverse of the failure rate and the terms can be used
== Importance of reliability prediction ==
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