Kaizen (改善?), Japanese for "improvement", or "change for the better" refers to philosophy or practices that focus upon continuous improvement of processes in manufacturing, engineering, and business management.
kai-zen (カイゼン) n. a Japanese business philosophy of continuous improvement of working practices, personal efficiency, etc. <ORIGIN> Japanese, literally ‘improvement’. The New Oxford American Dictionary. Also see Toyota Kata.
Source: Wikipedia, ScrumPloP.