Store-Level DRP Still Not Widespread Even though store-level DRP implementation continue to spread, the fact remains that store-level DRP today still accounts for small part of the total volume retail supply chains. Furthermore, there is still a significant gap between the demand planning and execution of B2C compared to B2B supply chains. B2B supply chains have been forecasting sales and orders starting at the end customer for many years. Computerized materials requirement planning (MRP) systems started in manufacturing organization in the 1960s and led to the development of DRP systems. Over the past 40 years, countless manufacturers have deployed DRP solutions to drive the flow of products across their distribution network and to align their supply chains around a single forecast. DRP system allowed manufacturing supply chains to maintain an accurate and forward-looking bottoms-up computerized model of their extended business that accurately predicted sales, purchases, receipts, manufacturing and distribution from source to customer