LOL - realize I am late to the game here....but this one just popped into my head reading through your question....

While it could certainly snowball into something way deeper and "difficult" I think it has some real possibilities.... (and to give credit where it is due - Jeff Booth recently said something about this topic on a podcast)

How do you define the difference between hot and cold?

or something like that....for some reason when Jeff said it, it struck me as an impossible task when you really dig into it?