Answer these Questions 1) Identify and briefly describe four types of requirements that may be defined for a computer-based system.
Answer these Questions
1) Identify and briefly describe four types of requirements that may be defined for a
computer-based system.
2) An automated ticket-issuing system sells rail tickets. Users select their destination and
input a credit card and a personal identification number. The rail ticket is issued and their
credit card account charged. When the user presses the start button, a menu display of
potential destinations is activated, along with a message to the user to select a
destination. Once a destination has been selected, users are requested to input their
credit card. Its validity is checked and the user is then requested to input a personal
identifier. When the credit transaction has been validated, the ticket is issued.
a) Discover ambiguities or omissions in the above statement of requirements for part of
a ticket-issuing system.
b) Rewrite the above description using the structured specification approach described
in the slides. Resolve the identified ambiguities in an appropriate way.
Below is an example of the structured specification of a requirement for an insulin
pump
c) Write a set of non-functional requirements for the ticket-issuing system, setting out
its expected reliability and response time.
3) Using the technique suggested here, where natural language descriptions are
presented in a standard format, write probable user requirements for the following
functions:
i. The spelling-check and correcting function in a word processor.
ii. An unattended petrol (gas) pump system that includes a credit card reader. The
customer swipes the card through the reader then specifies the amount of
fuel required. The fuel is delivered and the customer’s account debited.
iii. The cash-dispensing function in a bank ATM.
note: attach picture is part of question 2b
Step by step
Solved in 3 steps
