This document discusses elements of resource planning, including material requirements planning (MRP), capacity requirements planning (CRP), enterprise resource planning (ERP), customer relationship management (CRM), supply chain management (SCM), and product lifecycle management (PLM). It provides overviews of each element, describing their functions in scheduling production and coordinating the flow of materials and information across business processes and with customers and suppliers. The elements are integrated to facilitate product design, manufacturing, delivery, and management of the product lifecycle from conception to disposal.