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A method for retrieving inventory items within an inventory system includes receiving a retrieval request that identifies an 4,509,123 A 4, 1985 Vereen inventory item and selecting, from a plurality of inventory 4,542,808 A 9/1985 Lloyd, Jr. et al. stations, an inventory station to fulfill an order associated with 4,669,047 A 5, 1987 Chucta the retrieval request. The method also includes selecting an 4,678,390 A 7, 1987 Bonneton et al. inventory holder from a plurality of inventory holders that 4,716,530 A 12/1987 Ogawa et al. store the inventory item and selecting, from a plurality of 4,780,817 A 10, 1988 Lofgren mobile drive units, a mobile drive unit to move the selected