Kaizen is a Japanese philosophy of continuous improvement. The Toyota Production System popularized this approach of having all employees stop production lines to suggest improvements. The kaizen cycle involves standardizing operations, measuring performance, innovating to meet requirements, and repeating. Key elements include teamwork, personal discipline, quality circles, and suggestions for improvement. The Shewhart cycle is a plan-do-check-act process used for kaizen. The 5 whys method is used to determine root causes of problems by asking why five times. Learning by doing improves productivity through practice and minor innovations.