Engineer from the physical limits first, then improve, rather than shaving a few days off a 74-day process by continuous improvement.

I don't love the other methods, which is continuous improvement. The problem with continuous improvement, it… First of all, you should engineer something from first principles at the speed, you know, with speed of light thinking. Limit it only by physical limits, and physics limits. And after that, of course you would improve it over time.