This study presents a framework for calculating the risk of various projects, especially projects under uncertain circumstances. First, the related literature is reviewed and then the relationship between risk and projects is examined. Using a case study an approach is provided to determine the project risk in uncertain circumstances where sufficient data is not available for decision-making. In the new proposed method, instead of using a purely qualitative method, Dempster-Shafer theory has

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... n used because of the limited data for decision making. Finally, the proposed method is examined based on a construction company and the results are presented.