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PFSs in comparisons with classic fuzzy sets provide degrees of membership, non-membership and hesitancy, and in comparisons with intuitionistic fuzzy sets (IFSs), they prepare the larger space to explain the agreement, disagreement and hesitancy grades. In this paper, to tackle the uncertainty of real-world projects and determine the critical path of projects by considering efficient criteria, such as time, cost, risk, quality and safety, a new group decision methodology is extended based on concepts of technique for order of preference by similarity to ideal solution (TOPSIS) and complex proportional assessment (COPRAS) methods under PFSs. Furthermore, a new modified version of the proposed methodology is used to specify the weight of each expert. Finally, a case study from the literature, concerning workflow schema of marble processing plants project, is presented to better express the capability of the proposed methodology.<\/jats:p>","DOI":"10.3233\/jifs-172252","type":"journal-article","created":{"date-parts":[[2019,2,12]],"date-time":"2019-02-12T13:53:23Z","timestamp":1549979603000},"page":"1375-1387","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":20,"title":["A group TOPSIS-COPRAS methodology with Pythagorean fuzzy sets considering weights of experts for project critical path problem"],"prefix":"10.1177","volume":"36","author":[{"given":"Y.","family":"Dorfeshan","sequence":"first","affiliation":[{"name":"Department of Industrial Engineering, Faculty of Engineering, Shahed University, Tehran, Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. 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