A System to Determine the Effect of Change Order for Roads Projects on Execution Time

Abstract

The current study aims to create a computer program estimates the time required to complete the additional work due to the change command by evaluating the cost of these works. A  set of mathematical formulas and arithmetic equations are utilized for programing purposes. Furthermore, the difference of time due to the change order (Y), which was calculated  depending on the cost of these works (X). Furthermore these equations were developed by statistical analysis of the data collected from change orders for roads in Salah al-Din Governorate.  Then the program was verified and valuated by a group of engineers through making a survey.  Briefly the practical benefit of the program was very good, with a recurrence rate of (50%) based on the evaluation of these engineers. The benefit of using the program in future projects was good, with a recurrence rate of (49.8%).

Also, the most frequent works in change orders for road projects at Salah al-Din Governorate has specified and concluded. It was found that the works of operating and cleaning roads were repeated at a rate of (30%) in the change orders. Moreover, the earthworks were repeated at a rate of (20%), and the drainage works repeated at a rate of (20%). These results are used to focus on these works when preparing schedules of quantities for future projects to avoid errors in estimating quantities and the problem of increasing time and cost resulting from change orders of these projects.