A method of item-level order fulfillment, said method comprising: storing items as inventory items in an automated storage and retrieval system; retrieving inventory items from the automated storage and retrieval system in response to an order for those inventory items; sorting inventory items into order batches at a batch pick function; delivering the order batches to an induct to an automated put wall; and inducting individual items from the order batches at the induct for sortation into orders at the automated put wall, including removing the individual items for an order together from the automated put wall and transporting those items together to a packing function, wherein the removing the individual items for an order together comprises withdrawing the items from at least one bin of the automated put wall with a robotic pick or put system, wherein said sorting inventory items into order batches at the batch pick function is performed with goods-to-person or a goods-to robot systems and said inducting individual items from the order batches is performed at the induct for sortation into orders at automated put walls and wherein the delivering the order batches comprises selectively routing order batches from one of the goods-to-person or goods-to-robot systems to the induct of one of the automated put walls, characterized in that a first robotic pick or put system of the automated put wall delivers individual items from the induct to selected bins in two order racks, one on either side of a center aisle, and wherein the first robotic pick or put system and a second robotic pick or put system are provided, each capable of withdrawing the items from order bins of ones of the order racks and transferring the items of orders together to a corresponding conveyor (20a, 20b) for transport to the packing function. storing items as inventory items in an automated storage and retrieval system; retrieving inventory items from the automated storage and retrieval system in response to an order for those inventory items; sorting inventory items into order batches at a batch pick function; delivering the order batches to an induct to an automated put wall; and inducting individual items from the order batches at the induct for sortation into orders at the automated put wall, including removing the individual items for an order together from the automated put wall and transporting those items together to a packing function, wherein the removing the individual items for an order together comprises withdrawing the items from at least one bin of the automated put wall with a robotic pick or put system, wherein said sorting inventory items into order batches at the batch pick function is performed with goods-to-person or a goods-to robot systems and said inducting individual items from the order batches is performed at the induct for sortation into orders at automated put walls and wherein the delivering the order batches comprises selectively routing order batches from one of the goods-to-person or goods-to-robot systems to the induct of one of the automated put walls, characterized in that a first robotic pick or put system of the automated put wall delivers individual items from the induct to selected bins in two order racks, one on either side of a center aisle, and wherein the first robotic pick or put system and a second robotic pick or put system are provided, each capable of withdrawing the items from order bins of ones of the order racks and transferring the items of orders together to a corresponding conveyor (20a, 20b) for transport to the packing function. a first robotic pick or put system of the automated put wall delivers individual items from the induct to selected bins in two order racks, one on either side of a center aisle, and wherein the first robotic pick or put system and a second robotic pick or put system are provided, each capable of withdrawing the items from order bins of ones of the order racks and transferring the items of orders together to a corresponding conveyor (20a, 20b) for transport to the packing function.