Masaaki Imai developed the concept of Kaizen, which means "continuous improvement" in Japanese. The three main principles of Kaizen are teamwork, personal discipline, and improved morale. Kaizen focuses on eliminating waste through small, incremental changes and can be applied to both manufacturing and non-manufacturing environments. It uses a team-based approach and PDCA (Plan-Do-Check-Act) cycle to generate quick, measurable results and establish baselines for continuous improvement.