A method for executing orders by at least one robot on a plurality of items stored at locations throughout a warehouse including reading a bar code affixed to an item storage array disposed on said at least one robot. The item storage array includes a plurality of interconnected containers each for storing items associated with an order. The method also includes using the read bar code to retrieve information about at least one characteristic of the item storage array and assigning an order associated to each of the plurality of containers of the item storage array. The orders are based in part on the at least one characteristic of the item storage array. The method further includes navigating the at least one robot to locations throughout the warehouse to execute the orders associated with each of the plurality of containers of the item storage array.