What is it? I'm guessing something like.. "To determine which team kills other teams better" Regardless, whatever the purpose is determined to be... when other arguments are made, they should be viewed through this lens. So if there is a debate about whether mass driver should be allowed or not, and, assuming that the purpose is what I had guessed in the beginning of the post, then the "lens" would be, "Does mass driver being allowed in league prevent us from determining which team kills other teams better?"