Do The Simplest Thing That Could Possibly Work

This began as a question, maybe too long for WikiCase? So when I asked [KentBeck], "What's the simplest thing that could possibly work," I wasn't even sure. I wasn't asking, "What do you know would work?" I was asking, "What's possible? What is the simplest thing we could say in code, so that we'll be talking about something that's on the screen, instead of something that's ill-formed in our mind.