Modeling Circular Economy Using Industry 5.0 Technologies for Sustainable Engineering Projects: A Serial Mediation Model of Digital-Circular Capability
This study proposes and validates a serial mediation model demonstrating that an integrated "digital-circular capability" (combining Circular Economy practices and Industry 5.0 technologies) enhances sustainability performance in Saudi Arabian engineering projects by sequentially improving energy efficiency and cost efficiency.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
In the modern world, engineering organizations face a dual pressure that feels almost contradictory. On one side, there is a growing demand to use resources more sustainably, moving away from a simple "take-make-dispose" model toward a circular economy where materials are constantly reduced, reused, recycled, and recovered. On the other side, there is the rapid spread of advanced digital technologies, often grouped under the banner of Industry 5.0. This newer wave of technology builds on the smart automation and artificial intelligence of the past but redirects them toward specific goals: making systems more sustainable, more human-centered, and more resilient. The big question for leaders in energy, manufacturing, and construction is how these two distinct agendas—the desire to close the loop on materials and the push to adopt smart digital tools—actually work together to create real-world results. Does simply having these tools and practices guarantee success, or is there a specific chain of events that turns them into better environmental and financial performance?
A researcher set out to answer this by looking at the inner workings of engineering firms in Saudi Arabia, a region where energy use is a central concern for daily operations. They surveyed 147 engineering and technical professionals, asking them about their organization's practices in waste reduction, recycling, and the use of technologies like artificial intelligence and the Internet of Things. They were looking for a clear path that connects these digital and circular efforts to tangible outcomes like saving energy, cutting costs, and improving overall sustainability. What they found was a surprising unity in how these professionals experienced their work. Instead of seeing digital tools and circular practices as two separate things that happen to be linked, the data showed that the professionals experienced them as a single, integrated capability. They named this unified force "digital-circular capability," recognizing that in practice, the technology and the circular methods are so intertwined that they function as one operational package.
The study then traced exactly how this single capability translates into success. They discovered a specific, step-by-step pathway. First, this digital-circular capability leads to better energy efficiency. When organizations use smart monitoring and automated systems to manage material recovery and resource use, they naturally consume less energy. This reduction in energy use is not just an environmental win; it is the first domino in a chain that leads to financial gain. Because energy is a direct operating cost, using less of it for the same amount of output immediately improves cost efficiency. They found that this boost in cost efficiency is what ultimately drives better sustainability performance. In other words, the path to a greener, more sustainable organization runs through the wallet: smart circular practices save energy, which saves money, and that financial health allows the organization to sustain and expand its environmental efforts.
However, the story is not just about money. They also found that this digital-circular capability has a direct impact on sustainability performance that does not go through the cost-saving route. Even when the financial benefits are set aside, the act of recovering materials and using intelligent monitoring directly improves environmental outcomes. This suggests that while the energy-to-cost pathway is a powerful engine for change, the capability itself carries its own inherent value. They ruled out the idea that these digital tools simply lower costs on their own without first improving energy efficiency. The data showed no direct link from the capability to cost savings unless it first passed through the energy efficiency step. This distinction is crucial because it tells managers that they cannot just buy technology and expect the bills to drop; they must actively use that technology to monitor and reduce energy consumption first.
They were careful to note that their findings come from a specific snapshot in time and a single group of professionals, so the model they built is a strong suggestion rather than a final, unchangeable law. They openly acknowledged that their model was refined using the same data they used to test it, meaning future studies with different groups will be needed to confirm these results. Yet, the consistency of the findings across different ways of analyzing the data gives the results weight. The study explains more than half of the variation in sustainability performance among the firms surveyed, a significant amount in social science research. For project managers and policymakers, the message is clear: do not treat circular economy practices and digital transformation as separate initiatives to be managed in isolation. Instead, they should be planned as a single program where smart technology is the primary tool for managing material recovery and energy use. By making energy monitoring a core part of these projects, organizations can unlock a chain reaction that turns resource efficiency into economic strength and, ultimately, a more resilient and sustainable future.
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