TL;DR: Understanding Variation by Donald J. Wheeler is the most influential book in my Lean journey. It taught me how to distinguish signal from noise in data, avoid overreacting to normal variation, and focus leaders on improving systems instead of blaming people. Those lessons directly shaped my later work, including Measures of Success, for which Don graciously wrote the foreword. For my latest “LinkedIn Influencer” post, I was asked to participate in a series about … Continue reading The Book That Changed Me: Understanding Variation by Donald J. Wheeler