Upon the completion of national road projects, their cost and time deviations are often reported. These deviations from the projected values are a result of complications in the time and cost management of such projects. Controlling the cost and time overrun of projects is important for successful implementation and efficient project management. However, few studies have attempted to measure the project cost and time management efficiency in civil engineering. Thus, this issue requires further investigation. In this study, large road projects that had poor cost and time management were selected. The chosen projects were configured as Decision Making Units (DMUs) in a Data Envelopment Analysis (DEA). DEA is a non-parametric modern mathematical tool for measuring relative managerial performance and determining efficient DMUs. A list containing the causes of cost and time deviations and the percentage deviation for each DMU was prepared. The cost and time management efficiency of the DMUs was calculated using DEA, and the resulting values were ordered according to importance. It is believed that this process will contribute to better cost and time management.
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