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- Title
A dynamic modelling of labor productivity impacts arising from change orders in road projects.
- Authors
Ghazi Al-Kofahi, Zain; Mahdavian, Amirsaman; Oloufa, Amr
- Abstract
It is vital to investigate the system dynamics (SD) between change orders and labor productivity to identify the causes of productivity loss in construction projects. Most productivity loss studies are financed by the contractor and rely on the contractor's data. There is a gap in the literature concerning the labor productivity impacts of change orders on the part of the owner. This research utilizes a previously developed SD model to highlight the problem of productivity loss resulting from issuance of a change order. We conducted a sensitivity analysis to evaluate the impact of overtime, overmanning, temperature, and learning on the behavior of the SD model quantifying change orders' impact on labor productivity when their effects are simulated. Based on the results, SD is more reliable than the measured mile analysis (MMA) approach for the compensation request, considering the leading factors affecting the productivity loss other than the change order. The model developed in this study can accept or reject the responsibility of a change order for the occurrence of productivity loss.
- Subjects
LABOR productivity; DYNAMIC models; CONSTRUCTION projects; SYSTEM dynamics; SENSITIVITY analysis
- Publication
Canadian Journal of Civil Engineering, 2022, Vol 49, Issue 2, p159
- ISSN
0315-1468
- Publication type
Article
- DOI
10.1139/cjce-2020-0456