In Japan, generally, people have not well discussed on the climate risk management options including mitigation and adaptation. This research is evaluating to understand stakeholders' needs for scientific knowledge and their views of the climate risk management strategies. In addition, stakeholder's processes of decision-making and value judgments were investigated to understand the consensus building. As a first step of the study, we selected high-level people, who experienced decision-making processes in their institutes. They are former highly ranked government officials who used be in the position to make decision of country's strategies on climate change. A separate meeting will be conducted with medium- or low-level government officials with the same theme with the meeting of high-level officials, to find difference in the process of decision making. In these meetings, people representing various sectors, say environment and industry, were called to discuss on the same agenda related to the climate risk management. Our test meetings focused into two sections: a long-term climate risk management strategy, and decision-making beyond short-term mitigation targets or ad hoc regional-scale adaptation discussions. Therefore, the discussions to consider global-scale or national-scale targets were selected Based on the above test meetings, we are investigating to identify key differences in positions of climate issues, value judgments, and processes of decision-making.  Results expected to have direct effect on scientific knowledge in an easy-to-understand style and communication. Nevertheless, we also expect to make an active discussion environment for creating a future vision of sustainable society through collaboration between science and society.