No one knew specific approaches for decontamination measures. We, therefore, conducted surveys, analyzed the results, and gained knowledge for establishing the best conduct guidelines. Even if administrative authorities appealed that observation data showed safe levels, it was quite difficult for citizens to feel reassured. After local residents discussed specific decontamination procedures in their own areas, administrative authorities reflected the residents' opinions in decontamination plans and announced them. Such participatory approaches gained the understanding of the public and helped relieve their concerns. We believe that not only the development of infrastructure, but also the collaborative work between administrative bodies and the public enable and promote reconstruction progress.