第三，一个迭代或者阶段的退出标准不完全。
Third, the "exit criteria" for an iteration or phase is not sufficient.
在产品开发周期的这些阶段上所做出的不完全的思考和决定，常常在产品的发布和维护阶段突然出现。
Incompletely thought through decisions at these phases of the product lifecycle often crop up further down the line when it comes time release and maintain the software product.
本文在分别评述故障树分析方法、多阶段任务系统和不完全覆盖的基础上，由简单到复杂，逐步深入研究相关的系统可靠性分析方法。
We step by step find approaches for system reliability from simple to complex upon introducing fault tree analysis, phased mission systems and imperfect coverage, respectively.
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