Order processing is the process or work-flow associated with the picking, packing and delivery of the packed items to a shipping carrier and is a key element of order fulfillment. Order processing operations or facilities are commonly called 'distribution centers' or 'DC's'. There are wide variances in the level of automation associating to the 'pick-pack-and-ship' process, ranging from completely manual and paper-driven to highly automated and completely mechanized; computer systems overseeing this process are generally referred to as Warehouse Management Systems or 'WMS'. Order processing is the process or work-flow associated with the picking, packing and delivery of the packed items to a shipping carrier and is a key element of order fulfillment. Order processing operations or facilities are commonly called 'distribution centers' or 'DC's'. There are wide variances in the level of automation associating to the 'pick-pack-and-ship' process, ranging from completely manual and paper-driven to highly automated and completely mechanized; computer systems overseeing this process are generally referred to as Warehouse Management Systems or 'WMS'. Order processing is a sequential process involving: The order picking or order preparation operation is one of a logistic warehouse's processes.It consists in taking and collecting articles in a specified quantity before shipment to satisfy customers' orders.It is a basic warehousing process and has an important influence on supply chain's productivity. This makes order picking one of the most controlled logistic processes. It is one of the warehouse management system functions.