This book summarizes how to simply master the "PDCA efficient working method" and continue to practice it throughout your life. This book summarizes six main reasons for failure to achieve good results: pursuing perfection in plans, devoting all your energy to one thing, being too optimistic about work deadlines, not setting specific numerical goals, incomplete verification methods, and blind self-confidence. These six problems can be solved through the PDCA efficient working method. If you are facing a task that makes you feel difficult, and feel miserable about your work or life, you will definitely be able to start a new life after reading this book.