Order processing is the process or work-flow associated with the picking, packing and delivery of the packed items to a shipping carrier. Order processing is a key element of order fulfillment.
Order processing is a sequential process involving:

• Picking: consists in taking and collecting articles in a specified quantity before shipment to satisfy customers' orders.
• Sorting: process that separates items according to destination.
• Pre-consolidation or package formation  : includes weighting, labeling and packing.
• Consolidation: gathering packages into loading units for transportation, control and bill of lading.