At the heart of most supply chains lies a planning tool called Material Requirements Planning (MRP). Invented in the 1950s, codified in the 1960s and commercialized in the 1970s, MRP became THE way of life for supply order generation and synchronization. What used to take teams of people weeks to plan could be done overnight with incredible precision. Yet planners and buyers that interact with MRP everyday know that something is very wrong. They may not be able to explain exactly why but they know that if they did exactly what MRP told them to do, it would have disastrous consequences for their company and for their career. What if there was one fatal flaw in MRP that makes it completely incapable of conveying relevant information? What if correcting this one fatal flaw allowed the promise of MRP to be attained? Precisely Wrong: Why Conventional Planning Systems Fail will reveal this fatal flaw and trace its impact to everyday situations encountered by planners and buyers. Additionally, an elegant solution to overcome this flaw will be discovered. Readers will walk away with a new depth of understanding about conventional planning systems and a list of things they can begin to implement the very next day.