Some key points of operational concern in a DC include Quality and accuracy of delivery, Movement into and out of facility, Slotting and retrieving.

•  Quality and accuracy of delivery, 
• Movement into and out of facility, 
• Slotting and retrieving. 

Describe one challenge in each of these three areas and how it might affect the costs of the DC (i.e. why it's important to focus on doing it well).