Reliability analysis is often based on worst-case assumptions to produce guaranteed lower bounds on system survival probability. Reliability engineers make lower bounds as tight as possible, but sometimes system structure is unfriendly to the derivation of tight bounds. Unfortunately, loose reliability lower bounds make it difficult to compare design alternatives or to select among competing systems.

中文翻译：

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可靠性倒置：一个警示故事

可靠性分析通常基于最坏情况的假设，以产生有保证的系统生存概率下限。可靠性工程师使下界尽可能紧，但有时系统结构对紧下界的推导不友好。不幸的是，松散的可靠性下限使得比较设计备选方案或在竞争系统中进行选择变得困难。