EXTREME PROGRAMMING EXPLAINED, by Kent Beck

I read this book after starting to practice XP. It helped me understand how the practices worked so well together to achieve the principles.

What I put into practice:

+ I stopped trying to systematically apply all XP practices in an eXtreme way, but rather identified and applied specific practices which bring value to my business, such as continuous traceability, continuous code coverage mesure and continuous functional coverage measure.

I RECOMMEND THIS BOOK.