One of the basic assumptions for classical PERT-Time model is that the expected time for an activity te is the weighted mean of the optimistic time a,the most likely time b, and the pessimistic time c, with the weights for a ,b ,c being 1,4, 1, r
Wang Chengbin . , {{custom_author.name_en}}.
Some Limitations of PERT-Time Model and Its Improved Approach. Systems Engineering - Theory & Practice, 1991, 11(2): 0-0 https://doi.org/10.12011/1000-6788(1991)2-105731
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