We'll respond shortly.
Here’s an interesting mental exercise that recently I’ve found more and more valuable:
You might be surprised how often your assumptions turn out wrong. And, you might be surprised what you learn when you explicitly state those assumptions and then have to justify them when they do turn out wrong.
If you don’t test drive, or you don’t always test drive, (and you’re still reading), ask yourself this: what happens those times when my assumptions are wrong and I don’t have tests to protect me?