Sears implemented new logistics management practices in the 1990s to improve efficiency and compete with rivals like Walmart. They developed four independent logistics channels and used military-inspired practices like cross-docking, the "three ups and three downs" rule, and mobile wireless systems. Sears also collaborated with vendors through initiatives like Collaborative Planning, Forecasting and Replenishment to better forecast demand and replenish inventory. These changes helped Sears revamp their logistics system and reduce costs.