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US PATENT DOCUMENTS 3,689,106 A 9/1972 Young 3,938,608 A 2f1976 Folco-Zambelli 4,375,354 A 3, 1983 Henriksson 4,530,056 A 7, 1985 MacKinnon et al. 4,554,724 A 11, 1985 Bantz 4,562,635 A 1, 1986 Carter 4,630,216 A 12/1986 Tyler et al. 4,779,203 A 10, 1988 McClure et al. point is a location of an inventory holder. The method further includes docking the mobile drive unit with the inventory holder and moving the mobile drive unit and the inventory holder to a second point within the workspace. The second point is associated with conveyance equipment. The method further includes moving the inventory holder to a third point within the workspace using the conveyance equipment.