The number of things that go wrong while testing is about the same, but the difference is they go wrong on your computer instead of millions of customer’s computers.

And you know, you can keep the old system as a back up in case it breaks when it goes live. I guess that's too much to ask of the agency that keeps all of the airplanes from crashing.

They did test SMART and they weren't trying to roll the whole system at once. It worked fine in DC and FL for over 2 months. It worked fine for most of this week.