Max-Erich Sommerfeld was born on August 14, 1957, and studied Mechanical Engineering and Economics in Berlin. Married since 1989, he accumulated extensive experience in the industry throughout his long professional career. He began his career in various companies in Berlin before focus-ing on long-term roles with two renowned firms. Over 32 years, he acquired comprehensive knowledge and expertise in Manufac-turing and Lean Manufacturing. In March 2020, he retired and has since used his time to travel and share his knowledge and experiences. In this story, largely based on true events, he intertwines the world of Lean Manufacturing with his own professional experi-ences. To respect the privacy of those involved, names and loca-tions have been changed for a respectful portrayal of events. For better readability, this book consciously avoids gender-specific language. Of course, all readers are equally addressed and invited to engage with the content.