Almost five years after the first edition of this book, which was released with great success, the renowned software engineering guru and father of Extreme Programming (XP), Kent Beck, offers a fresh perspective on this controversial topic. XP remains the most popular agile methodology in software development, and many believe it is ideal for small to medium-sized development organizations. However, XP also has its critics. The goal of the book remains to help programmers and teams decide whether XP is the right path for them. The book provides advice but does not follow a prescriptive, step-by-step approach. This fifth anniversary edition deepens the comprehensive knowledge of XP and provides both proponents and skeptics of XP with detailed information to move forward with an informed opinion.