Identification of Causes of Non-excusable Delays of Construction Projects

One of the key characteristics of the projects, especially construction projects. is executing the scope of work in a specific amount of time. As project time overrun may have bad consequences for the project performing organization such as cost overrun, damage of company's reputation, etc. it is important to clarify between causes of excusable delays and causes of non-excusable delays. Major purpose of this paper is to identify non-excusable delays of executive companies of Mapna Group in order to improve time performance of the project by managing better these causes. The scope of the research is the projects including thermal power plant, steam and power and utility projects which are completed or being executed by these affiliated companies. In this paper top 20 causes of non-excusable delay of construction projects have been identified by a Delphi questionnaire survey and applying Mean Rank method. To determine whether there is degree of agreement among the panel of experts with respect to their ranking of the causes of non-excusable construction delays, a test of hypothesis was developed and a significant degree of agreement among the expert was verified. "Not selecting competent subcontractors" was selected as the most important cause of none-excusable construction delays.