An Integrated Framework to Evaluate the Impact of Preconstruction Planning on Out-of-Sequence Work
Eldamnhoury, Ebrahim S.
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For decades, the construction industry has faced a well-documented, persistent decline in its productivity levels. The reasons behind the declining productivity rates have been tackled by extensive research; however, some research areas remain underdeveloped, such as out-of-sequence work (OOS). This study fills this missing gap by investigating the preconstruction planning of OOS work. In this research, OOS is defined as an activity or series of activities that are not performed according to planned logical productive sequence and it was evaluated using four metrics. A project-based survey was developed to gather quantitative performance data from 42 projects. The data collected showed that 15% of the total project activities are performed out-of-sequence, causing a 33% increase in construction schedule and a 25% increase in construction cost. Statistical analyses were then performed to assess the impact of OOS on 6 performance metrics spanned over the three performance areas. The results indicated that OOS has a significant impact on 5 performance metrics. The prime objective of this research is to provide better understanding of managing the preconstruction stage to improve project performance through mitigating OOS. To accomplish the overarching goal, the research team analyzed 42 construction projects, some were impacted by OOS and others were not, to identify the highest-impacting factors that can be considered early in the planning stage to mitigate OOS. Furthermore, the research investigated the overall effect of OOS on project performance with an emphasis on labor productivity. To this end, the research provides a comprehensive tool for industry experts and practitioners to predict the level of impact of OOS on projects. In addition, the research findings offer managerial insights on how practitioners can better manage preconstruction stage to mitigate OOS work effectively.