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日期：2020-10-26 10:50

158.225 Systems Analysis and Modelling

Instructions:

Time allowed is TWO Hours.

The Examination Question Paper is not to be removed from the exam room.

Write your answers in the Blue Script Book supplied.

This exam uses Inspiroscan. Enter all your answers to Part A on the InspiroScan Form.

Ensure that your name and identification number are entered clearly on the InspiroScan

Answer Form. Answers should be recorded directly on this form: Shade-in the entire

circle surrounding the character (A-E) that best represents your chosen answer. If

subsequent changes are required, cross through the original answer circle clearly with

an X, before selecting an alternative. Use ballpoint pen (blue or black); pencil is not

permitted. Please follow all instructions carefully on the InspiroScan Information Sheet

provided, otherwise answers may not read correctly.

This is an Open Book examination.

This exam paper will be available at the library after the exam period.

Section A

25 Multiple Choices each worth 1 mark 25 Marks

Section B

1 Written Answer Case Study Question in 3 parts

Part 1 worth 10 marks

Part 2 worth 10 marks

Part 3 worth 5 marks

Section A (25 marks)

This section contains 25 Multi-choice Questions worth 25 marks in total. For each question

there is only ONE correct answer (A, B, C, D or E).

1) Which is not an element of object-oriented analysis and design?

a. Object

b. Class

c. Method

d. Inheritance

e. None of these

2) What are the two broad categories of UML diagrams?

a. Structural and Use case.

b. Behavior and Logical.

c. Structural and Behavioral

d. Logical and Physical

e. Relational and Temporal

3) Which of the following belongs to UML interaction diagrams:

a. Class diagram

b. Object diagram

c. Sequence diagram and activity diagram

d. Communication diagram

e. C and D

4) The following diagram indicates:

* Takes 0..5

a. A student can take exactly 5 subjects.

b. A student can take zero or up to 5 subjects.

c. A subject can be taken by zero or up to 5 students.

d. A subject can be taken by 0 or more students.

e. B and D

5) ___ is an example of a non-functional requirement.

a. The system helps an artist by selling his/her artworks.

b. The system should response to a request within 3 seconds.

c. The system is accessible by the public.

d. The system allows users to login.

e. None of these.

6) Sarah would like to know how to improve the current system in an interview with the

manager. She should ask ___ questions.

a. closed-ended

b. open-ended

c. probing

d. indefinite

e. short

7) Which of the following constructs cannot be used by a class diagram?

a. Class

b. Association

c. Aggregation

d. Use case

e. Multiplicity

8) Derived attribute is shown in a class diagram with the symbol ___, ___ the name.

a. /, before

b. \, before

c. /, after

d. \, after

e. None of these

9) If an object of interest in the system analysis has too many states, we can ___ .

a. do nothing at all

b. choose a new object to replace the old one

c. split the object into sub-objects

d. create sub-classes for the objects of different states

e. abandon the object

10) In an activity diagram, swimlanes ____ .

a. show which events are associated with which decisions

b. show which events are associated with which objects

c. show which activities are associated with which objects

d. show which activities are associated with which actors

e. show which objects are associated with which actors

11) ____ means that the same operation in a classes and its subclass may have

different implementations.

a. Aggregation

b. Association

c. Polymorphism

d. Abstraction

e. Stereotyping

12) An association can be found in ____ .

a. class diagrams

b. use case diagrams

c. communication diagrams

d. A, B, and C

e. None of these

13) The focuses of a behavior state diagram, a communication diagram and a class

diagram are ____, ____, ____, respectively.

a. object, object, object

b. object, object, class

c. class, object, object

d. class, class, object

e. class, class, class

14) ____ relationship in use case diagram allows use cases to be associated to the

optional use cases.

a. Association

b. Extend

c. Include

d. Generalization

e. None of these

15) In an activity diagram, if two paths of events are not mutually exclusive, then we

cannot use ____ .

a. fork node

b. join node

c. merge node

d. decision node

e. C and D

16) The ___ layer involves the requirement definition, use case diagrams, and

communication diagrams.

a. foundation

b. system architecture

c. human-computer interaction

d. data management

e. problem domain

17) Which statement about the following figure is TRUE?

a. This is a use case diagram.

b. Stick figures represent actors.

c. The names of the three stick figures are Child, Parent, and Parent,

respectively.

d. Finally, the second stick figure will keep the sandwich.

e. All of these.

18) Which of the following relationships is an aggregation?

a. Ball, color

b. Employer, employee

c. Department, university

d. Teacher, student

e. Lesson, teacher

19) Which of the following relationships is a generalization?

a. Word, sentence

b. Tutor, college

c. Toe, foot

d. Man, animal

e. Body, boy

20) Based on the sequence diagram below, which of the following statement is TRUE?

a. The campus housing service provider constantly requests information from all

apartment owners in updating the system.

b. Since the apartment object has a priority lower than that of the two actors, it is

placed lower than the two actors.

c. Every message (operation call) has a return value. The return value must be

shown explicitly in any sequence diagram.

d. The apartment owner is the initiator of the use case.

e. No object is created in the process.

Answer the following 2 questions (21-22) based on the activity diagram below.

21) Which of the following statement is NOT true?

a. The main actor of this activity is a student.

b. One has to fill out the enrollment forms before the actual enrollment.

c. One cannot fill out the enrollment forms correctly without any help.

d. One must make an initial tuition payment before the enrollment activity is

committed.

e. None of these.

22) The fork and join nodes of activity diagram means that ___ .

a. attending university overview presentation is more important than enrolling in

seminars

b. the three activities between the fork and join nodes are executed by a unique

actor

c. one may either attend the university overview presentation or enroll in

seminars by making an initial tuition payment

d. one may attend the university overview presentation before or after making an

initial tuition payment

e. none of these

Answer the following 3 questions (23-25) based on the class diagram below.

23) What does display() represent on the class of Clock?

a. A message.

b. An attribute.

c. An operation.

d. An implementation of the display() of CurrentMode.

e. None of these

24) Object o is passed to a method as a parameter of type CurrentMode. When one

calls o.display(), what operation is actually called?

a. The display() of CurrentMode.

b. The display() of Time.

c. The display() of StopWatch.

d. The display() of Calender.

e. A, B, C, or D.

25)Object o is passed to a method as a parameter of type Calender. When one calls

o.display(), what operation is actually called?

a. The display() of CurrentMode.

b. The display() of CurrentMode first, then the display() of Calendar.

c. A type error will be thrown.

d. The display() of Calender.

e. A or D.

Section B (25 marks)

This section contains 1 written answer case study question worth 25 marks, divided into

three sub questions worth 10, 10 and 5 marks respectively. You should attempt ALL parts of

the questions. Your answers should be written in the answer book.

Case Study Description

A library loans three different kinds of items to customers: books, video tapes and compact

disks (CDs). Each item has a title and publisher. In addition, books have authors, and CDs

have artists. The library may have multiple copies of the same book, video tape or compact

disk. There are two different kinds of customer: students and staff. For both kinds of

customer, the library has their name, sex and address. Students may borrow at most 20

items whereas staff may borrow at most 100 items.

To borrow an item from the library, a customer must provide a valid ID to the librarian. The

librarian must make sure that the customer has no overdue items to return and fines to pay

before checking the item out.

Case Study Questions

When answering questions 1 to 3 you should adhere to good naming conventions and

name all your model elements in an appropriate way. You should clearly state any

assumptions you make.

1) Draw a use case diagram and then draw an activity diagram for the Borrow Items

Use Case. (10 marks)

2) Draw a class diagram for the system. Your diagram should include relevant classes,

associations, attributes, multiplicities, and other relevant elements. You do not have

to provide methods or classes that do not use/produce data. (10 marks)

3) Draw an object diagram for the class diagram developed in 2) above. Showcase a

situation where a staff David (male, address: Blk 131, sg) has a book called “The Old

Man and the Sea” written by Ernest Hemingway, published by Scribner’s, overdue 5

days (up to the date today), and needs to pay a fine of 5 dollars. (5 marks)

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