Study on Participatory Infrastructure Development Planning Systems with Conflicts of Interests Explicitly Considered

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This research analyzes participatory processes for public infrastructures. In modern society where many citizens with various value judgments co-exist, coordination and cooperation for efficient decision on social infrastructures is mandatory, especially Japan as a quickly economically matured country without explicit treatments of social conflicts on public planning. Based on investigations on public participation and related institutions in the North America, this project clarifies the key structures of participatory decision making in public planning in Japan. For the first year of the project, the fact findings on Japanese and other participatory planning are performed. Also, as basis for theoretical works some related game theoretic concepts and tools are clarified through the several research meetings. In the second year of the projects, opinion-aggregation process among stakeholders is modeled as a game model, and roles and involvement of the coordinator/third professional party is clarified. Moreover, participatory institutions and facilitation techniques were investigated by the interview with relevant institutions in Ontario, Canada. In the final project year, the following aspects of participatory processes are modeled and analyzed. They are : opinion-aggregation process, roles of professionals in the process, and cognitive structure of participants. On the other hand, other institutional problems in participatory processes that are hardly modeled into mathematical formula are descriptively clarified especially by referring to the North American systems. These results provide structural information on vice and virtue of participatory process, and can contribute to the building of the Japanese participatory policy of Japanese infrastructure planning. Main part of the project results had been put in the project report.