What Not to Do
Managers and developers will object to particular practices. You will be tempted to defend them, or your support of them, on theoretical grounds. Don't. These things are irrelevant. Instead, discuss the objection in the context of winning. Remember that winning is the goal, not the individual practices per se, or being right. The practices are simply ways to help you win. They are not "good" or "bad"they are only better or worse than the available alternatives.
The reality is that you will have to justify and defend XP practices eventually. If everyone involved agrees that getting results is the goal, you have a ready-made standard for evaluating XP practices against other options. If a practice increases your chances of getting results, do it. If it doesn't, scrap it or change it so that it does work in your environment.
Finally, don't focus on XP for the sake of XP. This will label you a zealot in a nonproductive religious war. Remember that getting results is the goal, not XP or you being right.
In Chapters 4 and 5 we discuss how to handle manager and developer resistance in more detail.