Mean time between failures

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Mean time between failures (MTBF) is the overall average time between product breakdowns. Usually expressed in terms of operating hours.

Definition

According to Managing Quality by Foster (6th edition),

Mean time between failures (MTBF). The overall average time between product breakdowns. Usually expressed in terms of operating hours.

According to Juran's Quality Handbook by Defeo (7th edition),

Mean time between failures (MTBF). The mean (or average) time between successive failures of a product.