The Importance of a Prototype

The benefit cost ratio is really quite hard. Has there ever been a time when you've done this and haven't learned something? No, actually. But every time I go into it, I am frightened that I'm not going to learn something. Every time. Because I don't know anything about their customers. And they really are passionately believing this is it. They say things that are so confident in their assumptions. Aren't we always? We're still coming in.