Also, manufacturing supply chain participants found that the could rigorously compare all of their bottom-up predictions to their aggregate targets; they could manage exceptions and make adjustment to deliver planned results with the least disruption and at the lowest cost. These DRP capabilities enabled the development of the extended forward planning process that process that we know today as sales and operations planning (S&OP). Without similar bottom-up forward planning capabilities, retailers have been unable to plan their business in detail over an extended horizon and to assess and optimize these plans in advance. Store-level DRP solution will close this gap and provide the basic for a similar leap forward in planning and execution capabilities for retail supply chains