The assumption that the duration of a project and the whole project's finishing time is random and submitted to some kinds of probability distribution is the theoretical basis of the PERT.
PERT的理论基础是假设项目持续时间以及整个项目的完成时间是随机的，且服从某种概率分布。
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This time of uncertainty for the characteristics of project activities, combined with the introduction of PERT MCS duration of the project to solve the problem to solve.