Applied Requirements Engineering - Exercises

An automated ticket-issuing system description:

"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..."

What is the key ambiguity created by describing the process in two different sequences in the same paragraph?

Which of the following are genuine omissions in the ticket-issuing system description? Select all that apply.

When rewriting the ticket-issuing system description using a structured approach, in which field would you describe the condition under which the ticket is issued (e.g., credit transaction validated and personal identifier correct)?

In a structured specification for the ticket-issuing system, which of the following would be an appropriate post-condition for the 'Issue Ticket' function?

Consider writing non-functional requirements for the ticket-issuing system covering reliability and response time. Which of the following are well-written, testable non-functional requirements? Select all that apply.

Consider writing user requirements for the cash-dispensing function in a bank ATM. Which of the following are appropriate user-level requirements? Select all that apply.

Consider an unattended petrol pump system. The customer swipes their credit card, specifies the amount of fuel required, fuel is delivered, and the customer's account is debited. Which of the following correctly captures this as a user requirement in standard natural language format?

Consider the spelling-check and correcting function in a word processor. Which of the following are appropriate user-level requirements for this function? Select all that apply.

How might an engineer responsible for drawing up a system requirements specification keep track of the relationships between functional and non-functional requirements? Which approach is most effective?

Consider developing use cases for an ATM system. Which of the following would be appropriate use cases (interactions) in an ATM use case diagram? Select all that apply.

For an ATM use case diagram, which of the following would be the actors? Select all that apply.

Who should be involved in a requirements review? Which groups should participate? Select all that apply.

Sort the following steps in a requirements review process into the correct order.

Suggest a process model for making emergency software changes while keeping requirements and implementation consistent. Which of the following is the most critical principle for such a model?

True or False: When a system is changed first and the requirements document is updated later (or not at all), the requirements specification and system implementation will almost inevitably get out of step.

Consider this scenario:

You have taken a job with a software user who has contracted your previous employer to develop a system. You discover that your current employer's interpretation of the requirements is different from your previous employer's interpretation. You know that costs to your current employer will increase if the ambiguities are not resolved. However, you also have a confidentiality obligation to your previous employer.

What is the most professionally ethical course of action?

In the previous scenario (conflicting interpretations), which professional obligations are in tension? Select all that apply.

A librarian tells you: 'Obviously, all acquisitions are catalogued before they are added to the collection.' This statement illustrates which key challenge in requirements engineering?

A product manager says: 'The ticket-issuing system should be very reliable.' Which of the following rewrites this as a properly testable non-functional requirement?