All measures for controlling, monitoring and managing requirements, i.e. change requests, that the customer has for the new system.
The application scenario or use case (e.g. buying coffee at a coffee vending machine) describes all steps of interaction between a consumer or user with a system (e.g. inserting money, selecting product) and all externally perceivable reactions of the system (e.g. requesting more coins to be inserted, ejecting a coffee cup, making the coffee, etc.). The result of the use case can be [...]