In the first edition of this landmark book, business loyalty guru Fred Reichheld revealed the question most critical to your company's future: 'Would you recommend us to a friend?' By asking customers this question, you generate a vital metric: your Net Promoter Score. In the five years since the book was published, Net Promoter has transformed companies large and small, across industries and sectors. Far more than a metric, it constitutes a game-changing system and ethos that rivals Six Sigma in its power. In this thoroughly updated and expanded edition, Reichheld, with Bain colleague Rob Markey, explains how practitioners have built Net Promoter into a full-fledged management system that drives extraordinary financial and competitive results.