Question

Consider an Opal ticket-issuing system and write down a set of non-functional requirements related to reliability and response time for such a ticket-issuing system?

Answer 1

Answer:------
Non-functional requirements related to reliability and response time for such a ticket-issuing system include:-------

1. Between 06:00 and 23:00 in any one day, the total system down time should not exceed 5 minutes.
2. Between 06:00 and 23:00 in any one day, the recovery time after a system failure should not exceed 2 minutes.
3. Between 23:00 and 06:00 in any one day, the total system down time should not exceed 20 minutes.
4. After the customer presses a button on the machine, the display should be updated within 0.5 seconds.
5. The ticket issuing time after credit card validation has been received should not exceed 10 seconds.
6. When validating credit cards, the display should provide a status message for customers indicating that activity is taking place.
7. The maximum acceptable failure rate for ticket issue requests is 1: 10000.
8. The system shall continue to function so long as roll of ticket paper is in the machine, and a network connection is provided for the destination database and credit transactions.
9. Upon receipt of the destination from the user, the database shall be accessed to determine the distance from the unit’s location, to the desired destination, and calculate the appropriate fee.
10. The reliability this system relies on the durability of the physical user interface, the network connection in the area the system is placed, the size of the ticket rolls that the unit can accept, and the mechanism for dispensing the tickets.