Wal-Mart has achieved tremendous success through efficient supply chain management practices such as centralized distribution, direct procurement from manufacturers, efficient logistics and transportation systems, and information technology to track inventory and sales. Key aspects of Wal-Mart's supply chain include the "hub and spoke" distribution system, use of EDI and RFID technology, collaborative planning with suppliers, and inventory management techniques like cross-docking and replenishment of stores from distribution centers. While initiatives like CPFR and RFID implementation presented challenges, Wal-Mart's focus on low costs, customer satisfaction, and supply chain innovation have been pivotal to its dominance as the world's largest retailer.