The top thing for me really comes down to the cohesiveness in the design. I mean, and when you hear rich hicky talk about a, i'm charmed what the name of the talk is. It was his hammock driven development talk where he's just talking about sitting down and solving problems. And kind of contrasting that with this a cult of a test driven development,. Where we write tests and then, you know, build around that - but don't spend the time sometimes actually think through it.