In this paper, in order to clarify the effect of the number of poles in debate-like communication-field mechanisms, we conducted experiments on the subject of “Kudan-no-Sengen,” which is the activity using drama method to experience direct democratic decision-making. Although “Kudan-no-Sengen” is similar to the debate, which divides participants into two teams, the activity divides participants into four teams, i.e., four poles. In this study, we reformulated “Kudan-no-Sengen” and conducted experiments comparing “Kudan-no-Sengen” with two poles and that with four poles. As a result of experiments, it is revealed that the participants felt more fun and felt that they were able to generate more opinions in the condition with four poles than with two poles. In addition, it is revealed that the participants changed their opinions more in the condition with two poles than with four poles. The design of the number of poles in the discussion is an essential design element in the mechanism design of the communication-field. Discussion in this paper gives important suggestions in all communication-field mechanisms.
