Examining the historical and theoretical background of the diagram as a generative device and the concept imbedded design process, this paper proposes a hypothetical architectural design method focusing on the origin of the diagram. Differing from earlier research that sought the origin outside of architecture itself, this method draws upon existing buildings as sources for the design of new buildings. The theoretical validity of the suggested method was discussed in relation to current issues in Architecture. To measure its the potential application of the practical field of architecture, more than 70 student projects were conducted in the architectural design studios at Hanyang University ERICA. The projects show diverse applications of the method and the students’ drawings illustrate each step of the studio brief sequentially and rigorously. Through the pedagogical reflections, the potential application of the proposed design method to architectural field will be measured.