A Comprehensive Analysis of Change Orders Based on Project Progress in Design-Build Highway Construction
Publication: Construction Research Congress 2024
ABSTRACT
Understanding the nature of change orders is crucial for optimal project performance. However, limited research exists on change orders in the design-build (DB) context and their impacts considering the timing of change order occurrence. This study aims to investigate change orders in the DB environment regarding their frequency, schedule impacts, cost impacts, and the primary reasons for their occurrence, considering project progress. A scaling technique, parametric statistical tests, and classification were conducted utilizing 275 change orders from 29 US highway projects. The main findings indicate that project progress significantly affects change order frequency, while no statistically significant mean differences were observed in schedule delays and cost overruns based on project progress. Furthermore, this study identified principal change order reasons, including high-frequency/high-risk or low-frequency/high-risk types, based on their frequency, cumulative, and average impacts. This research contributes to the knowledge of change order impacts on project performance in alternative project delivery.
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Construction Research Congress 2024
Pages: 135 - 145
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Published online: Mar 18, 2024
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