Every business is a bundle of choices. Some choices are obvious—what product to sell, how much to charge. But the choices that often separate winners from also-rans are the hundreds of tiny operating decisions that no customer ever sees. They determine how fast a package arrives, how consistent a meal tastes, or how effortlessly a problem gets solved. To understand competitive advantage, we need a way to see those choices and how they connect. That’s what this chapter gives you: a toolkit to X-ray a company, map its core activities, and spot the invisible threads that turn a collection of tasks into a fortress that competitors struggle to copy.