چكيده به لاتين
One of the main concerns of project managers is to complete the project according to a predetermined timetable and allocated budget. Therefore, the importance of implementing projects in the shortest possible time is increasing. In addition, projects often encounter problems due to delays. In traditional and commonly used methods, the project manager tries to resolve this problem by increasing the time of each activity; this will lead to problems such as increasing variable costs and inventories. In recent years, the problem of planning, scheduling and managing the project cost is used to solve this problem using the Earned Value Management method. Due to reasons such as uncertainties of the duration of activities, restrictions imposed by management, multi-tasking Work teams spend more time than planned, using crisis management and implementing buffer management is used as one of the most practical management approaches to overcome the uncertainties of a project. Regarding the results, FB² and PB have the highest impact in the response prediction model for the SPI index, and the best value of the feed buffer for SPI index is 4.2 and the maximum value for project buffer. Also, the effect of the project buffer on the optimal state of the CPI index is 5.2 for the project buffer. Until time 32, which is almost 50% in project progress, the improvement in the performance index is negative, meaning that without buffering at 50% of the start of the project, it is over scheduled. In the second half of the project, the existence of the buffer will advance the schedule and lead project to succeed the schedule. Without taking the project buffer up to 90% after the run, the budget has not gone through and the cost is higher than the budget. This amount has been reduced in the project's progress. With the existence of the buffer, the cost performance index has reached 0.85 at the end of the project, which represents 0.2 reduce in the performance index.
Also, by analyzing the EAC index, the cost estimate at the end of the project is 1982, which is not influenced much by the project buffer. At the start of the project at time 5, which is approximately 8% of the project progress, the estimated final cost of the project is at minimum with the existence of the project buffer and feeding buffer. The lowest estimate for the EAC with a value of 852 at time 30 occurs at 50 percent of the project progress.
