Am I going to BET this flop or check?
Well, where does my holding fall in the ranges of my possible action? For example, if AK is at the TOP of the checking range, but in the middle of my betting range, I am better off betting.... hmmmm... perhaps this is too awkward to be used as a axiom.
Sometimes I think we (I) forget the simplest mantra of poker for post flop play:
"Does he fold a hand better than me? Does he call with a hand worse than me?" In those cases, bet. I recall Phil Gordon used to expound a variant of this (which I done like at all), "Am I ahead? Bet. Am I behind? Check". I think he might have been oversimplifying for the medium he expressed this to/in, but its awful if taken at face value.