> Assume the software will do the worst thing possible. That's certainly a valuable lesson when there's hardware and software involved, and the consequences of

> Assume the software will do the worst thing possible. That's certainly a valuable lesson when there's hardware and software involved, and the consequences of the software screwing up are potentially lethal. But what about the case of the home depot shopping cart, or the iPhone alarm? In those cases there's only software. "Assume the software will do worst thing possible" doesn't make sense.