John Spence: "There is no single strategy that will carry your company forever—just ask my buddy Tom Peters, who wrote the fantastic book In Search of Excellence back in 1982, only to watch more than half of the companies he highlighted go out of business! Markets shift, consumer preferences change, new competitors appear, technology advances—and so must you. Even though I can recommend which of today’s popular strategies I believe deserve your attention, there is no guarantee that these same strategies will still be as relevant in 20 years. I think they will, but no one can see that far ahead.

With all of that said, [these] are the six strategies on which all the great companies I studied were relentlessly focused."