Celluar Phone Customer Use Cases

title   = customer who wishes to purchase a phone
actor   = customer
goal    = to make a purchase
scope   = the current store
success = item in stock, customer has enough money, then purchases, receives, and leaves with item.

title   = customer who wishes to change phone data plans
actor   = customer
goal    = to make a change to an existing data plan, they want less data for lower cost
scope   = the current store
success = customer is not in a contract, the plan exists, does cost less
failure  = customer signed a two year contract that has not expired, they are unable to make the change