In my consulting and research I’ve seen many companies launch process improvement programs such as Total Quality Management, Business Reengineering, Lean, and Six Sigma. Many got significant benefits, including lower costs, faster time-to-market, and better customer experiences. But after one round of improvement, they gave up and let their organization get flabby again. Organizations, like people, need to stay fit and make improvement a habit to be competitive. So why don’t they? Why is sustained process improvement so rare?