What is XP (Extreme Programming)?
An agile software development approach built around close customer collaboration, short feedback cycles, and mutually reinforcing engineering practices. These include test-driven development, pair programming, continuous integration, refactoring, and simple design.
My perspective
In practice
I find XP most useful as a connected set of practices rather than a checklist. Tests make refactoring safer; refactoring keeps designs changeable; frequent integration exposes problems early. A sustainable pace and direct customer feedback help the team decide what to build, not just how to code it.