[T]here has been a growing perception that moonshots are the primary model for radical innovation at Google, and chiefly responsible for our greatest product and technical achievements. What I have seen during my 15 years at Google does not match that perception. I contend that the bulk of our successes have been the result of the methodical, relentless, and persistent pursuit of 1.3-2X opportunities -- what I have come to call "roofshots."