We make a discussion everywhere about various things from a little one to a serious one. The purpose are also various such as for improving something, defeating opponents, spreading their opinions and so on. However I think some manners are necessary in order to make a meaningful discussion. First, we should not call names. Second, we should carefully listen to what others say, and then say own opinions. We should not insist one-sidedly. Third, we should make a discussion in order to improve something, not to annoy others. What manners do you have when you discuss something with others?