QUICK THOUGHT: The engineering practices in Extreme Programming (Like TDD, Pair Programming, etc) can lead you to improving your code. But it won't do it for you. TDD will point out design flaws, but it won't GIVE you good design skills. If you write lousy code, you'll find it very hard to maintain practicing XP, but XP won't MAKE your code better. You still have to do it. You STILL have to read books, write code and share with other developers.

KAIZEN!

~Lee