"…So one question that gets asked around testing is, well, when do we stop? How do we know when to stop? We have an infinite number of things we could do, an infinite amount of inputs and infinite number of things we could observe. Well, how can we make the decision to stop? Because if we stop too early, we might miss things. We might be just on the point of finding information. How do we stop? Well, we have to learn how to make decisions.…"