Recently, in Japan, the diversification of clients' demand in construction projects leads to emergence of various professions, such as construction managers, project managers, cost engineers, façade engineers and project finance advisers. Therefore, a new method of forming the project organization as an assemblage of such various professions should be developed. The final goal of this research project is to develop a method for optimizing the project organization from the clients' standpoint. This paper summarizes the second stage of the research project. The authors investigate the roles of 10 types of professions in three projects and classify them in view of the task and the period of time assigned to each profession in the sequence of sub-process of the construction project. The authors interview 6 types of professions for their tasks and backgrounds, and finally discuss the emergence process of diverse professions.
