3.3.1 Sharing the work of order-picking
A customer order may be picked entirely by one worker; or by many workers
but only one at a time; or by many at once. The appropriate strategy depends
on many things, but one of the most important is how quickly must orders flow
through the process. For example, if all the orders are known before beginning
to pick, then we can plan efficient picking strategies in advance. If, on the other
hand, orders arrive in real time and must be picked in time to meet shipping
schedules then we have little or no time in which to seek efficiencies.