One of main activy in warehouses is the orderpicking process. It’s the process where (parts of) orders are assigned to one or more orderpickers. Different strategies can be applied:

• Zoning policy: The total pick area may be divided into picking zones, to be served by different orderpickers. Two alternative policies exist:
• • Parallel zoning or
  • Sequential zoning.
• Batch policy: Orders are picked one by one (single order picking) or in batches (batch picking).

If Batch picking policy, Picked orders must be sorted in one of two sorting policies:

• • pick and sort (sequentially)
  • sort while pick (simultaneously).

• Routing policy: define the sequence of retrievals and the route to visit the retrieval locations.

Dwell point policy may prescribe the position of idle orderpick equipment.