In the present article, after giving a definition of Project Evaluation & Review Technique (PERT), the reasons which make this method inefficient as well as its shortcomings are explained. Then a new method on the basis of probability distribution function with its different procedures is introduced. In this method, the shortcomings of PERT method, which stem form simplifying, unrealistic assumptions are eliminated. The assumptions of the PERT method underestimate the project completion time.
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