Wal-Mart has achieved success through effective supply chain management. It procures goods directly from manufacturers and maintains long-term vendor relationships. Barcode technology and handheld computers aid distribution. Over 3,500 company-owned trucks deliver goods, using experienced drivers. Information technology benefits inventory and logistics through satellite communication, automated reordering systems, radio frequency tracking, and algorithms. Centralized data systems and barcoding improve efficiency. These supply chain practices lower costs and deliver goods faster than competitors, giving Wal-Mart a competitive advantage.