The planning system consists of Master Production Scheduling (MPS+PLUS) and Material Requirements Planning Plus (MRP+PLUS). MPS+PLUS is a powerful yet flexible and easy to use tool that helps you create a plan that meets your customer service levels within the physical constraints, such as capacity, of your operation. MPS+PLUS provides simulation tools that enable you to test the feasibility of alternate schedules. MPS+PLUS is a day-quantity detail planning system that calculates the what, when, and how many of an Item that are required to support the production plan.