If you are having a friendly argument over a policy issue, ask the person you disagree with to explain how their preferred policy would work, describing "step by step, from start to finish, the causal path from the policy to the effects it was supposed to have." Read the rest

http://feeds.boingboing.net/~r/boingboing/iBag/~3/S45O-weB_-E/how-to-change-someones-opini.html