Adding a new teller | queuing theory example
www.johndcook.com/blog/2008/10/21/what-happens-when-you-add-a-new-teller
What Jamie wrote
Nearly every technical system of moderate complexity will use queues at some place, and there will inevitably be a time when those queues backup and cause problems. It can be very hard to explain those issues to non-technical folks. This simple article does a good job highlighting the non-linear behavior of queues.