The focus of this study was to clarify the integrated design process from an educational standpoint, and identify its influencing factors and the role of facilitator. Through a literature review, the integrated design process and the role of facilitator were framed, and through the case study, the whole process of integrated design and the facilitator's role were analysed from the preparation phase to the assessment phase. The integrated design studio was conducted for 16 weeks with third-year undergraduate students who had various academic backgrounds. The integrated design studio was composed of three integration elements: integration of knowledge, integration of research and development methods and systematic integration of process. Each phase of the integrated design process and the facilitating role of the instructors were empirically analysed. After the integrated design studio, the students' perspective on its effectiveness and the difficulties encountered were analysed quantitatively. The results showed that the effective integration in design education should place a high importance on integration of knowledge and R&D phases, and the facilitator's role should be focused to maximise the multidisciplinary collaboration effect.