In Japan, the word for constant and never-ending improvement is kaizen. Not only is kaizen an operating philosophy for modern Japanese businesses, it’s also the age-old philosophy of the warrior class—and it has become the personal mantra of millions of successful people all over the world. Virtually all world-class achievers, in business, sports, and arts, are committed to continual improvement. They understand that in order to succeed in an ever-changing world, they must constantly learn and evolve. They don’t wait until external influences, such as a teacher, manager, or industry development force them to gain new skills or knowledge. Rather, they are self-motivated learners constantly looking for new ways to improve their performance and deepen their understanding of the world around them.