what to do if the zone for
one class of product is filled and an incoming shipment is
assigned to that class. In most of the reviewed papers,
planning for storage operation was done with the goal of
minimizing picking time. Such studies can be extended to
target less congestion and better spread of workload by
considering replenishment operation during idle or nonpeak time. Extension of these studies can be on planning
for restock time of the forward picking area.