Models of design tend to contain activities that relate to multiple disciplinary and professional fields. The rapid advancement of technology and the increasing social, economic, and environmental challenges demand more sophisticated models of the design process. The term “design process” captures a wide variety of views and practices in different disciplines such as engineering, business and product design. This paper starts by examining the interdependencies and relationships between design activities across disciplines. The aim is to formulate an inter-disciplinary approach that informs and guides flexible design approaches. The resulting approach is subsequently compared to conventional educational approach in engineering, business, and product design. The paper closes with a categorised overview of the academic literature on design process from various disciplinary lenses. This work gives researchers and educators an understanding of the breadth and depth of design process, and the connectivity across disciplines during the development of new products and services.