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p-Index From 2021 - 2026
0.408
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All Journal Advance Sustainable Science, Engineering and Technology (ASSET)
Mawardi Amin
Mercu Buana University
Chemistry Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering

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Quantitative Modeling of Change Order Impacts on Cost and Time Overruns in Indonesian Toll Road Infrastructure Projects Hadi Sasmito; Mawardi Amin
Advance Sustainable Science Engineering and Technology Vol. 8 No. 3 (2026): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i3.2425

Abstract

Change Orders (COs) are a major challenge in toll road infrastructure projects, often causing cost and time overruns. This study aims to identify key CO drivers and quantify their impacts on project performance in Indonesian toll road projects. A mixed-methods approach was applied, involving qualitative interviews with 35 experts (project managers, consultants, contractors) and quantitative surveys from 75 respondents covering 20 projects implemented between 2015 and 2023. Data analysis employed descriptive statistics, multiple linear regression, correlation analysis, and hypothesis testing using SPSS. Results show that five significant factors, namely poor planning, technical design changes, discrepancies between plans and site conditions, delays in land acquisition, and inadequate stakeholder coordination, explain 94.5% of CO variation (R² = 0.945). COs accounted for 94.9% of cost overrun variation (R² = 0.949) and 93.6% of time overrun variation (R² = 0.936). Design changes most strongly affected cost overruns (β = 0.419), while land acquisition delays had the greatest effect on time overruns (β = 0.537). COs have interrelated effects on cost and time, requiring integrated management from initiation to closure. The findings provide engineering and policy implications for precise contract documentation, rigorous planning, and proactive risk management to mitigate CO-induced overruns.
Analysis of Claims and Dispute Resolution in Construction Projects: a Case Study Approach Angga Ari Adi Pratama; Mawardi Amin
Advance Sustainable Science Engineering and Technology Vol. 8 No. 3 (2026): May - July
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v8i3.2460

Abstract

Disputes in construction projects are often inevitable due to various factors such as delays, cost overruns, and changes in scope. This study aims to identify the root causes of claims and examine the resolution strategies implemented in the Sierra Intercultural School construction project. Using a qualitative descriptive approach, data were collected through in-depth interviews with contractors, consultants, and owners, as well as analysis of supporting documents such as contracts and site reports. The study found that the most frequent claim types were time extension claims (37%), additional cost claims (28%), and design change claims (21%). These were primarily caused by design errors, late approvals, and incomplete work planning. Dispute resolution predominantly relied on negotiation and direct discussion, without involving formal legal or arbitration procedures. The findings indicate that effective contract documentation and proactive communication among stakeholders can significantly reduce claim occurrence. This research contributes to the field of construction management by offering practical insights into dispute avoidance and resolution mechanisms in medium-scale educational infrastructure projects. It also highlights the importance of early stakeholder alignment to prevent claims and delays in similar future developments.
Co-Authors Angga Ari Adi Pratama Hadi Sasmito