Toyota has long had a reputation for quality. This book argues that their reputation is the result of operational excellence. Many of principles in the book center quality within the operational system and the day to day processes within Toyota. Gemba walks hold managers responsible for observing and improving. Line workers check and confirm quality and own responsibility for shutting down the line when they find errors. Processes are designed to bring problems to the surface quickly so they can be remedied with urgency. summarize