The two methods both calculate the reliability of each module using Nelson module, then one of the methods calculates the reliability of whole system using Markov process, and the another using the different executing path.

• 两种评估方法都是先利用Nelson模型求出软件每个模块的可靠性，然后一种是利用马尔可夫过程计算出整个系统的可靠度，一种是根据程序执行路径的不同计算出整个系统的可靠度。