What are Advanced Planning Systems (APS)? Automotive suppliers are always in a state of flux. OEMs change their requirements as expected sales are lost or exceeded. Suppliers fail to deliver. Machines break down or the right skills are not available to do the job. However, most automotive suppliers continue to base their plans on systems that are bad at absorbing and reflecting all this information. While most Manufacturing Resource Planning (MRP II) and Enterprise Resource Planning (ERP) systems have Material Requirements Planning (MRP), Master Production Schedule (MPS) and Customer Requirement Plan (CRP), executives need more advanced systems to control the supply chain. Automotive suppliers need to assess how they can become more responsive to the real world.