Production planning and control (PPC) involves planning production activities, routing work, scheduling operations, loading work assignments, and following up to ensure work is progressing as planned. PPC has evolved since the late 19th century as factories grew in size and complexity. The Toyota Production System is renowned for its use of PPC principles like just-in-time production and continuous improvement. PPC allows for optimized resource use, cost control, and coordinated plant activities when implemented effectively.