This document discusses production planning and control (PPC) functions including planning, action, and control phases. It describes key PPC functions like estimating, routing, scheduling, loading, dispatching, expediting, inspection, and corrective actions. It also discusses benefits and limitations of PPC, how PPC is implemented in different production systems like job, batch, continuous, and process industries. PPC aims to efficiently utilize resources, reduce costs and cycle times, ensure quality production and timely deliveries through planning and monitoring production activities.