The Influence of Coordination and Supplier Availability on Material Mobilization and Timeliness of Infrastructure Projects in the River Waters in the Sumatra Region

Abstract

This study examines the influence of supplier coordination and availability on material mobilization and project timeliness in river infrastructure projects in Sumatra. The objective of the study was to analyze the direct and indirect effects of supplier coordination and availability on material mobilization and project timeliness. Respondents included contractors, management consultants, field managers, and field implementers. A sample of 155 respondents was selected. Hypothesis testing used PLS-SEM with the following steps: Modeling the relationships between latent variables; Selecting an algorithmic analysis method; Applying bootstrapping resampling to test model stability; and Constructing a path diagram to visualize causal relationships; and (5) Evaluating the measurement and structural models using reliability, validity, R-squared, and predictive relevance (Q²).The findings indicate that coordination has a significant influence on material mobilization, supported by effective communication, integrated planning, and stakeholder synergy, which ensures smooth material distribution. Material availability has a significant influence on material mobilization, underscoring the importance of efficient procurement and inventory management. However, coordination and material availability did not significantly impact project timeliness, suggesting that other factors, such as labor efficiency, technical constraints, and design changes, play a more dominant role in determining project completion schedules. This study underscores the need for a holistic project management approach to achieve timely project completion. Future research should explore factors beyond coordination and material availability, such as risk management, digitalization in supply chain management, and the implementation of just-in-time (JIT) systems in material distribution, to improve construction project efficiency.