| ability to perform as required, under defined conditions of use and maintenance until a defined end state is reached.
Note 1 to entry: The degree to which maintenance is within the scope of durability will vary by product or product group.
Note 2 to entry: The end state can be based on technological, social or economic aspects.
Note 3 to entry: Durability can be expressed in units appropriate to the part or product concerned, e.g. calendar time, operating cycles, distance run, etc. The units should always be clearly stated.
Note 4 to entry: Durability as a measure relates to the longevity of the interval from initial use until the defined end state.
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