The Caterpillar Production System (CPS) is the way Caterpillar unites the Operating, Cultural, and Management Systems to pursue Order-to-Delivery excellence. CPS enables the Enterprise Strategy built on the foundation of Our Values in Action and 6 Sigma—the Strategic Area of Improvement (SAI): Order-to-Delivery and Critical Success Factors (CSFs): PEOPLE, QUALITY, VELOCITY, and TROUGH.