This is a list of tips for having "productive" arguments. For the purposes of this list, "productive" means improving the accuracy of at least one person's views on some important topic. By this definition, arguments where no one changes their mind are unproductive.

Sometimes the onlookers will change their position. When arguing with someone sufficiently mind-killed about a topic (and yes there are people like that on lesswrong), that's the best you can hope for.