Can effective change management improve manufacturing economics? This paper explores the economic impact of design changes during engineering and manufacturing, highlighting the advantages of computer-based systems for managing these changes. The study contrasts computer and paper-based systems, emphasizing the superior control and efficiency offered by computerization. A company's experience using a computer-based system is reviewed, analyzing the sources and control of design changes, as well as the resulting benefits. Bespoke and proprietary software are briefly discussed. The findings underscore the essential role of engineering design change management in successful manufacturing organizations. The bespoke system described led to considerable improvements in the company’s change control process, demonstrating tangible benefits. This analysis provides insights for companies seeking to optimize their design and manufacturing processes. Future research could explore the application of AI and machine learning to further streamline design change management.