No one has come up with the definitive list of key performance indicators for retail stores today and there’s a few reasons for that. First, retail is changing so fast that which metrics will be most important when the changes are complete is not yet known. Second, retail stores of the future are going to be less like each other than they have been in the past.

Forbes contributor Richard Kestenbaum, who also is a co-founder and partner at Triangle Capital LLC, writing last month on Forbes.com about the way retail store performance is measured.