xtreme Programming (XP) is an agile software-development methodology. XP helps you remain light on your feet by avoiding unnecessary baggage and by incorporating feedback continuously. Changing requirements are an expected and acceptable risk, because the customer sees the system being developed in real-time. Mistakes are immediately visible and are corrected while the feature's implementation is fresh and pliable, much like a potter reworks clay. Programmers work and rework the code in XP projects. The customer sees a system grow from layer upon layer of detail. The software is only as effective as the details it embodies. A tax accounting system must round computations correctly, or it can't be used; it's insufficient to get the formula right without considering that taxes are collected in whole currency units. Details matter, and XP programmers reflect back to the customer in the only way that matters: working code.
All this working and reworking requires a stable base and good tools. To throw pots effectively, you need to be seated comfortably at your potter's wheel, and your tools need to be within easy reach. In the world of idea creation, people need comfort, too. They need to know what's expected of them and why. An XP team is expected to follow 12 simple practices. You aren't supposed to execute the practices blindly, however. XP gives us a framework of four core values that lets us adjust the practices to suit our particular project. The four core values are like a comfortable mental chair; we work our code using the practices with the core values supporting our every movement.
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