Good question! I think it would be useful to try something like Double Crux: (http://lesswrong.com/lw/o6p/double_crux_a_strategy_for_resolving_disagreement/ htt

Good question! I think it would be useful to try something like Double Crux: (http://lesswrong.com/lw/o6p/double_crux_a_strategy_for_resolving_disagreement/ http://lesswrong.com/lw/o6p/double_crux_a_strategy_for_resol...) Say Person B is proposing a change from Solution A -> Solution B. Person A thinks Solution A is still the correct approach. I think it's important to understand in detail what aspects of Solution B are appealing to Person B. It may be subtle, psychological, and/or political, but there's a reason why this change is important to person B. Person A & Solution A must address those issues, or risk eventual obsolescence. It's also entirely possible that the more correct approach is Solution C, and this process can help establish what exactly that is.