The most labor-intensive task in many warehouses is collecting the right items for each order. Order picking is the process of retrieving products from storage locations to satisfy customer or replenishment orders.

Methods include discrete picking, batch picking, zone picking, and wave picking. Technology ranging from paper lists to voice systems, pick-to-light, and mobile robots guides the worker or automates the travel. Layout, slotting, and pick-path design strongly influence productivity.

Accuracy and speed trade off against each other if processes are poorly designed. Measuring lines per hour and error rate keeps improvement focused. Because picking often dominates warehouse labor cost, small efficiency gains produce large financial effects.

• Retrieval of items from storage to fill orders
• Uses discrete, batch, zone, or wave methods
• Supported by voice, light, or robotic aids
• Major driver of warehouse labor cost