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对于多阶段任务系统的可靠度计算是很困难的问题。不可能依功能直接写出数学模型;当各阶段任务不独立时,直接计算概率的条件也不充分。因为这是特殊的条件概率问题。目前国外常用C·Persels最小割集法解这类问题。但它求最小割集的方法
It is a very difficult problem to calculate the reliability of multi-stage mission system. It is impossible to write the mathematical model directly according to the function; when the tasks in all stages are not independent, the conditions for directly calculating the probability are not sufficient. Because this is a special conditional probability problem. At present, C · Persels Minimal Cut Sets are commonly used abroad to solve such problems. But it is the least cut set method