I worked as the main representative in technical negotiations and meetings with large Japanese firms, mainly in Tokyo. You needed to learn that a Yes answer did not mean Yes as we understand it, but yes they got the meaning of our point. So you not only have to listen carefully to what is being said, but also understand the culture of the person that is saying it. Agents, Lawyers and the like also have their own culture but as others have said, it centers on the best interests of their clients.