Root Causes of Design-Construction Interface Problems in Iranian Design-Build Projects

AbstractThis article aims to identify design-construction interface problems and their causes in design-build projects to present solutions to resolve these problems. Accordingly, through a qualitative multiple–case study approach in four Iranian design-build projects, 26 problems were identified, some of the most important of which are too much employer interference in design and construction, poor planning and scheduling, and poor decision making by employers. Knowing the causes and their causation, which are related to all project phases, can help practitioners consider them and avoid their unfavorable consequences in future projects, improve the interface integration, and make better decisions that can potentially enhance project performance. In addition, the problems were prioritized to determine the top 10 problems. Eventually, the experts recommended 10 solutions according to the most important causes and two main root causes, including poor public culture and misunderstanding of the design-build term. In conclusion, it is worth bearing in mind that this study opens a new perspective in exploring the root causes of design-construction interface problems.