Identify source of claims in urban projects (Case Study: Tehran Metro DBF Projects)

Claims have become inherent features in projects and in particular urban projects that have a negative impact on the time and cost of project implementation. To solve this problem, it is possible to prevent the occurrence of a claim in a project by identifying the root causes of the claim (source) and reducing its impact on the direct causes of the claim (cause). In this regard, in a two-stage study, first claims of DBF contracts in Tehran metro projects were collected, and the source and cause of the claims were separated and distributed through the questionnaire among the experts, and the most important of each one was identified. In the second stage, using the Delphi method, the relationship between the source and the cause of the claims (the effect of the origins on each cause) was identified and distributed through the questionnaire among experts and based on that the most important source of each cause of the claim was identified. The research findings indicate that the look at the sources should be due to the importance of its impact on any cause of the claim, and a separate look at the source of the claim will not show the importance of each source and with this look it’s better to know their significance so that better strategies can be put in place to prevent them. The results of the research show that managerial changes in the employer (Tehran municipality) and inappropriate selection of the project delivery system are one of the most important sources of claims in urban projects.