Bioethics is often said to be an interdisciplinary field of study. However, “interdisciplinary” is a complex term. In the initial stages of the debate on brain-death in Japan, it was quite typical for symposiums comprising researchers and others from multiple fields to begin with “from the standpoint of medicine,” “from a legal perspective,” or “from a philosophical point of view,” before presenting their own opinion from the specialty field. However, as various opinions were voiced from different fields, this approach was considered “interdisciplinary.” Unfortunately, this approach cultivates a very shallow level of debate. This, in turn, means that valid interactive conversations never begin. At the time of the brain-death debate, communication skills within science and technology had not yet developed in Japan, and there was little that could be done when facing this first major problem in bioethics.

A truly interdisciplinary conversation will never begin if we merely listen to the perspectives of the specialists, but then investigate the issue no further. So the question remains: what does it mean to be truly interdisciplinary? I feel that truly interdisciplinary dialogue implies a particular posture taken when addressing a given problem. Thus academic debate should result in the participants achieving a deep understanding of each other’s opinions, and even if a resolution is not achieved immediately, obtaining the sense that “the discussion moved forward/the understanding of the other person has deepened.” Dialogue can only begin with a general understanding. As the dialogue begins and the discussion continues, a mutual understanding of each participant’s views is deepened further, and the result is something that might be considered truly interdisciplinary. Nonetheless, it is difficult to define exactly that what is “truly interdisciplinary,” but one prerequisite might depend on the “attitude” of those involved while conducting the dialogue.

In the present chapter, I will give an example. The paper below has not been published elsewhere. Using sumo wrestling as an example, one author wrote the first draft without limiting the argument to any one academic field. After the first draft was created, other authors from a variety of specialties added the flesh to the skeleton. All co-authors consented to the publication of this article in the present text. It is written with terminology from ethics, philosophy, sociology, law, psychology, and anthropology. Scholars in some specialties may criticize this as superficial. However, as a discussion increases in specialty, more specialized terminology is used such that some researchers may not be able to understand sufficiently the writings of their colleagues in other fields. One other criticism may be, “Well, that’s somewhat interesting, but you need to deepen the discussion.” However, to “deepen the discussion” in one specialty field would make this less interesting to those in other fields.

Sports ethics, which has a slightly different feel from the other themes mentioned thus far, is becoming an important field within bioethics. I hope that my readers will consider the relevance to the objectives of the text below as we discuss the topic of sumo wrestling, the national sport of Japan.