IS203 – Software Engineering
Name (as on Student Card):
IS203
Software Engineering
INSTRUCTIONS TO CANDIDATES
(Please read this page only. Do not open the paper until instructed)
1. This is a close-book examination. Please remove everything from your workspace except for
pens, pencils, erasers, wipe outs and stapler before you begin. (No calculators)
2. The time allowed for this examination paper is 3 hours.
3. This paper contains total of 27 pages.
4. This examination consists of 2 parts.
a. Section A consists of 10 multiple choice questions (MCQ). Each MCQ is worth 2 marks.
For each question, select one or MORE choices. All correct choices must be selected to
be awarded 2 marks. 1 mark if 50% or more of the correct choices are ticked. 0 marks if
ANY wrong answer is ticked. CLEARLY mark each correct choice with a TICK beside it.
For example,
[  ] A.
SE is fun!
b. Section B consists of 4 questions. Each question is worth 20 marks.
5. All answers must be filled on this exam sheet. NO extra paper will be provided.
6. You must return all parts of this exam paper, properly stapled to the instructors. Missing exam
paper or parts thereof will be considered cheating.
Good Luck!
Marks
Section A (MCQ):
20
Section B (Short Qns)
10
Section C (Q 1):
20
Section C (Q 2):
20
Section C (Q 3):
20
Section C (Q 4):
10
TOTAL
100
IS203/2008-091/684088566
Awarded
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IS203 – Software Engineering
Section A [2 Marks Each]
1. Jimmy and Tommy are working on a local copy of the same file (lala.txt) managed by Git.
The following error is encountered when Jimmy tries to push to Git after a successful Git
commit.
git.exe push --progress "origin" master:master
To [email protected]:is203/G9T9.git
! [rejected]
master -> master (fetch first)
error: failed to push some refs to '[email protected]:is203-scratch/G9T9.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
git did not exit cleanly (exit code 1) (874 ms @ 26/11/2015 12:45:20 PM)
What should Jimmy do?
[
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A.
B.
C.
D.
E
Jimmy should pass the file to Tommy using a thumb drive.
Jimmy should delete his local copy and lose all his changes.
Jimmy should do a Git pull, resolve any conflicts in the file, and Git push.
Tommy should do a Git commit and Git push.
Tommy should do a Git pull and resolve any conflicts in the file.
2. The team discovers that they are behind schedule halfway through an iteration. The
project’s deadline is 6 month away. Which of the following is a possible action to be
taken by the team?
[
[
] A.
] B.
[
[
[
] C.
] D.
] E
Push some features scheduled in this iteration to the next iteration.
Push integration and regression testing for the current iteration to the
next iteration.
Ask the team to work overtime.
Add more people to the team.
Pray harder and hope that they are able to finish on time.
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3. Which of the following is an advantage of using a web application framework (Struts,
Spring etc)?
[
[
] A.
] B.
[
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[
] C.
] D.
] E
Provides most of the common functionality.
Avoid rewriting and revalidating common solutions to recurring
problems.
Easy to learn.
Increases code complexity.
Gives you bragging rights over your peers.
4. When using GQM (Goal-Question-Metric), you must do the following:
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A.
B.
C.
D.
[
] E
Be able to accurately measure the required metric.
Use complicated metrics as they are more effective than simple metrics.
Ensure that each question is mapped to one and only one metric.
Create a clear and actionable mitigation plan based on cut-off values
provided by the metric.
Use the metric to determine the overall best person in the group.
5. Good pair programming practices include the following:
[
] A.
[
] B.
[
] C.
[
] D.
[
] E
Rotating the people assigned to the pairs every now and then to
maximize learning.
Making sure the weaker programmers pair with each other to avoid
slowing down the team.
Creating pairs "on-demand" to maximize flexibility and scheduling
capabilities.
Ensuring that the driver's role is solely to type in the code specified by
the observer.
Rotating the driver and observer roles frequently.
6. Andrew tries to run his JEE web application (Apache Tomcat + MySQL) from NetBeans
IDE. Unfortunately the following error is reported: “java.lang.NoClassDefFoundError:
Could not initialize class is203.dao.ConnectionManager”. Which of the following BEST
describe the reason(s) behind the error?
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]
A.
B.
C.
D.
E
Java Development Kit (JDK) is installed.
Apache Tomcat is not installed.
MySQL database is not installed.
ConnectionManager.java is missing.
None of the above.
7. Which of the following BEST describe the difference(s) between Java Server Pages (JSP)
and Java Servlets:
[
] A.
A Servlet requires a Java Virtual Machine (JVM) while a JSP is executed by
the browser.
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[
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B.
C.
D.
E
A Servlet is internally compiled into a JSP.
A JSP but not a Servlet can have the same content as an HTML page.
A Servlet is not compiled by Tomcat 6.0 automatically, but JSP pages are.
All the above except B.
8. Consider the following two JSP pages located in the same directory.
<% int x = 0;%>
<jsp:include page="a.jsp"/>
<% x = x+1 %>
b.jsp
a.jsp
Is there an error(s) in the JSP pages? If there is/are, which of the following best describes
the error(s) (if any)?
[
] A. The files should be renamed to a.JSP and b.JSP respectively.
[
] B. The second line in b.jsp should be <%= x = x+1 %>
[
] C. There is no bug. The above two jsp pages are correct.
[
] D. The <jsp:include> should be replaced with an include directive.
[
] E
There is still a bug(s) which is not listed in the previous options.
9. Which of the following will result in a conflict that TortoiseGit can merge and resolve
automatically without manual intervention:
[
] A.
Jim edits lines 10 to 15 of apple.txt.
Tom edits lines 24 to 35 of apple.txt.
[
] B.
Jim edits lines 40 to 47 of apple.txt.
Tom edits lines 28 to 39 of apple.txt.
[
] C.
Jim edits lines 40 to 47 of apple.txt.
Tom edits lines 46 to 59 of apple.txt.
[
] D.
Jim edits lines 54 to 57 of pear.txt.
Tom edits lines 49 to 53 of papaya.txt.
[
] E
Jim edits line 2 to 5 of mango.txt
Tom deletes mango.txt
10. Given the schedule below, which of the following tasks are on the critical path?
Task
T1. Design UC "Add Student"
T2. Design UC "Register Course"
T3. Design Review
T4. Code UC "Add Student"
T5. Code UC "Register Course"
T6. Testing and Debugging
[
] A.
Pre-requsite
Nil
Nil
T1, T2
T3
T3
T4, T5
Start
1-Sep
1-Sep
5-Sep
6-Sep
6-Sep
10-Sep
End
4-Sep
4-Sep
5-Sep
8-Sep
9-Sep
10-Sep
Duration (days)
4
4
1
3
4
1
T1. Design UC "Add Student"
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[
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B.
C.
D.
E
T2. Design UC "Register Course"
T3. Design Review
T4. Code UC "Add Student"
T5. Code UC "Register Course"
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Section B [2 Marks Each]
1. At the end of every iteration, we do ___________ testing to ensure features completed
in __________ iteration(s) are bug free.
2. Task metrics (TM), as defined in the lecture slides, is a good metric for project that does
____________-boxing and it is tracked per _____________ basis.
3. The critical path is the ___________ amount of time to complete a project. If
_________ task on the critical path delays, the project delays.
4. The Rational Unified Process says that software development process follows 4 phases
namely (1) ____________________, (2) ____________________, (3)
____________________, and (4) ____________________.
5. Pair programming means two people are physically present using one laptop. One
person types on the keyboard and this person is called the ______________. The other
person, called the _____________, designs and tells the first person what to code.
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IS203 – Software Engineering
Section C [20 Marks Each]
1. A software firm, Fiasco!, is tasked to develop and implement a Donor Management
System (DMS) by the blood bank of the country. The team in Fiasco! uses RUP to
manage the project. To ensure quality delivery of the project, the project manager has
decided to use a Software Quality Metric as follows:
Goal: To create high quality software
Question: How many bugs do we have?
Metric: Number of bugs reported per iteration.
Use:
Condition
if bug count <= 5
if bug count > 5 AND <=10
Course of action
Action 1: Do nothing
Action 2: Re-schedule project to add in another day for
testing
Action 3: Re-schedule project to add in more time in every
iteration for testing
if bug count > 10
Current tracking:
End of Iteration Number of bugs
1
5
2
3
3
15
4
7
5
10
6
4
Actions
Do nothing
Do nothing
Re-schedule project to add in more time in every
iteration for testing
Re-schedule project to add in another day for
testing
Re-schedule project to add in more time in every
iteration for testing
Do nothing
Given this scenario, answer the following questions:
I. The metric above can be improved. State TWO specific things that are wrong with this
metric. Explain in two sentences or less why each thing is wrong.
Note: Your answer can include the metric itself, the mitigation plan, and the collected
data.
[4 marks]
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II. Give TWO suggestions of how we can improve this metric. For each suggestion, explain
clearly in two sentences or less why it improves the metric.
[4 marks]
After a few weeks, Fiasco!'s project manager decides to use an additional schedule metric to
further improve the tracking of the project.
III. What is ONE specific metric that can be used to track his schedule?
Note: This must be a formula that is easily computable. Make clear what you are using
as components of your metric.
[3 marks]
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IV. Give TWO different suggestions for when the PM should update and check the
schedule metric to determine if corrective action needs to be performed. For each
suggestion, list ONE advantage and ONE disadvantage of the suggestion. Be very
specific in your answers.
[6 marks]
V. Please list three cutoff values for the schedule metric (specified in III.) along with the
corrective actions to be taken for each cutoff value.
[3 marks]
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IS203 – Software Engineering
2. Infinity, a system integration company has been awarded a contract to develop Group
Get-together system (GG) for the Software Engineering teaching team. The project will
begin work on November 3.
Functional Requirements:
1. The GG system should automate the creation of Git repositories for Software
Engineering student groups. Each group has 5 pre-assigned students who are taking
the course.
2. The GG system should allow each student in a team to peer evaluate all other
members in the team. The consolidated scores will be released to each individual
team.
3. The GG system should allow each student in a team to submit their own timetable
and generate a consolidated team timetable. This will be used by the team and the
supervisors to determine the meeting time for the supervisor's meeting.
4. The GG system allows the instructors to upload a CSV file with the following columns
a. Name of Student
b. Student ID
c. Team name
Other Requirements
1. User-friendly and effective web-based user interface
2. The project must be finished in three months (i.e. end March).
3. The application must run on Tomcat & MySQL on Amazon Web Services cloud
platform.
4. The teaching team advocates agile processes. They have requested Infinity to show
them a working build at the end of every month.
Resources
Infinity has assessed the staff resources required by the project. The following project team
has been formed:
1. Kevin is a project manager who has successfully managed web application
development projects at Infinity for the last three years using Infinity Delivery
Methods (IDM). The methodology is a typical waterfall process where customers
have to do a sign-off on the requirements, before moving on to design and
implementation.
2. Jayson is an experienced Web page designer and HTML programmer.
3. Two Java programmers (Jaclyn & Clamen) are fresh computer science graduates and
were recently hired by Infinity. This is their first project but they have been exposed
to web development using JSP and Servlets in one of their previous modules.
The development team will develop using Tomcat & MySQL on a windows laptop. They have
a windows Server 2008 computer that they will use as an integration box.
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IS203 – Software Engineering
1
1.1
1.2
1.3
2
2.1
2.2
3
3.1
4
4.1
5
5.1
6
6.1
6.2
7
7.1
7.2
7.3
Iteration 1
Elicit Requirements
Produce Software Requirements
Specification (SRS)
Hold Review with the Customer
Iteration 2
Develop Use Case Realizations
Develop Sequence Diagrams
Iteration 3
Backend - GIT Repository Scripts
Iteration 4
Entity classes - Code Timetable
generator
Iteration 5
Entity classes - Code Peer evaluation
Iteration 6
Develop User Interface
Integrate all User Interface with
functionalities developed and
writing controllers
Iteration 7
Deployment to staging server
User Acceptance Test
Deployment to production server
Resource
Duration
Start Date
End Date
ALL
ALL
10 days
2 days
3 Nov 2008
17 Nov 2008
14 Nov 2008
18 Nov 2008
ALL
ALL
ALL
ALL
1 day
19 Nov 2008
19 Nov 2008
12 days
10 days
20 Nov 2008
8 Dec 2008
5 Dec 2008
19 Dec 2008
ALL
10 days
22 Dec 2008
2 Jan 2009
ALL
10 days
5 Jan 2009
16 Jan 2009
ALL
10 days
19 Jan 2009
30 Jan 2009
ALL
ALL
5 days
3 days
2 Feb 2009
9 Feb 2009
6 Feb 2009
11 Feb 2009
ALL
ALL
ALL
2 days
10 days
1 days
12 Feb 2009
16 Feb 2009
2 Mar 2009
13 Feb 2009
27 Feb 2009
2 Mar 2009
Note: Duration excludes Saturday and Sunday. Public holidays are considered as working
days.
Given this scenario, answer the following questions:
I. Kevin is going to use the schedule to track progress. State TWO issues that he will face
using this schedule. For each issue, explain in 2 sentences or less how it will hinder his
tracking of the schedule.
[4 marks]
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II. Kevin presented the schedule to James, the project director. James commented that
"This is absolutely crap. You are doing a waterfall process for a client who has
requested for an iterative process". Who do you think is right? Justify your answer in
less than thirty words.
[4 marks]
III. State TWO reasonable and relevant risks (unrelated to schedule) for this project. For
each risk, explain why it is a risk in not more than 2 sentences.
[4 marks]
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IS203 – Software Engineering
IV. State TWO things that can possibly go wrong when the team deploys the application
to the production server (Amazon Web Services cloud platform). State what the team
can do during development to reduce/eliminate each of the problems.
[4 marks]
V. The schedule has an iteration (Iteration 6) that involves developing and integrating the
user interface with the backend codes (i.e. entity classes). Is this a good/bad strategy?
Justify your answer in 5 sentences or less.
[4 marks]
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IS203 – Software Engineering
3. Use JSP to build a web portal for a simple point-of-sale application of a grocery store.
The grocery store only sells 3 items: apples, oranges, and grapes. The prices of apples,
oranges, and grapes are $2, $2.20 and $2.30 per kilogram respectively. In order to
increase sales, the shop gives two types of discounts to customers: regular and
privileged.
The business logic for the regular discount is as follows. If a customer buys more than 5
kilograms of apples, there is a 5% discount to the price of apples bought. Similarly if one
buys more than 5 kilograms of oranges, there is a 6% discount to the price of oranges
bought. Finally, there is a 7% discount to the price of grapes if one buys more than 5
kilograms of grapes.
Aside from regular discount outlined above, there is also a privileged discount. The shop
assigns discount codes for special customers. There are three different codes: AAA, BBB,
and CCC. For each, the discount rate is 5%, 10%, and 25% respectively. These rates are
with respect to the total price of fruits purchased, no matter how much is purchased. If
no discount code is provided, no privileged discount is given.
The actual discount given to a customer is the maximum of the two discounts (in $), i.e.,
if the regular discount is larger than the privileged discount, the regular discount is
given; otherwise, the privileged discount is given.
The flow of the application is as follows:
Click “Process Order”
Button
Point-of-Sale Page
(point_of_sale.jsp)
<<redirect / forward>>
Order Processing Page
(process_order.jsp)
Display Price Page
(display_price.jsp)
The point_of_sale.jsp page allows users to quickly enter a customer purchase order. A
snapshot of the simple user interface is shown below. Users first check the item(s) they
want to purchase and enter the corresponding quantity. If the checkbox is not checked,
whatever amount is written in the corresponding “Quantity” textbox is ignored by the
system. Users can also enter a privileged code if they have one.
The screenshot below is a sample of the Point-of-Sale Page (point_of_sale.jsp).
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After a user purchase is entered and the “Process Order” button is pressed, relevant
information will be passed to process_order.jsp which then computes the price that a
user must pay before and after discount.
Finally process_order.jsp page passes relevant information to display_price.jsp. The page
display_price.jsp in turn displays individual prices for apples, oranges, and grapes
purchased along with the total price (before and after discount) and the total discount
given.
The screenshot below is a sample of the Display Price page (display_price.jsp).
The HTML source generated by display_price.jsp (for the figure shown above) is as
follows
<html>
<table border="1">
<tr>
<th bgcolor="#C9C299">Item</th>
<th bgcolor="#C9C299">Price</th>
</tr>
<tr>
<td>Apple</td>
<td>$16.0</td>
</tr>
<tr>
<td>Orange</td>
<td>$0.0</td>
</tr>
<tr>
<td>Grape</td>
<td>$0.0</td>
</tr>
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<tr>
<td>Price Before Discount</td>
<td>$16.0</td>
</tr>
<tr>
<td>Discount</td>
<td>$4.0</td>
</tr>
<tr>
<td>Amount To Be Paid</td>
<td>$12.0</td>
</tr>
<table>
<a href="point_of_sale.jsp">Go To Point-Of-Sale Page</a>
</html>
Below is the code for the 3 pages. Fill in the appropriate code in the boxes provided. Do
NOT modify code outside the boxes provided.
- point_of_sale.jsp <html>
<form name="p-o-sale" action="process_order.jsp" method="get">
<table border="1">
<tr>
<th bgcolor="#C9C299" align="center">Item</th>
<th bgcolor="#C9C299" align="center">Quantity (KG)</th>
</tr>
<tr>
<td><input type="checkbox" name="fruits" value="apple"/>
Apple
</td>
<td><input type="text" name="apple-qty" value="0"/></td>
</tr>
<tr>
<td><input type="checkbox" name="fruits" value="orange"/>
Orange
</td>
<td><input type="text" name="orange-qty" value="0"/></td>
</tr>
<tr>
<td><input type="checkbox" name="fruits" value="grape"/>
Grape
</td>
<td><input type="text" name="grape-qty" value="0"/></td>
</tr>
</table>
Special Privilege Code: <input type="text" name="priv-code" size="3"/>
<br/><input type="submit" value="Process Order"/>
</form>
</html>
- process_order.jsp // import the necessary packages used
[1 mark]
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//You must use hPrivileged to compute privileged discount
<%
// Step 0: Initialization
HashMap<String,Double> hPrivileged = new HashMap<String,Double> ();
hPrivileged.put(“AAA”,0.05);
hPrivileged.put(“BBB”,0.10);
hPrivileged.put(“CCC”,0.25);
// unit prices for fruits
double appleUnitPrice = 2;
double orangeUnitPrice = 2.2;
double grapeUnitPrice = 2.3;
// use
double
double
double
these to store the total price of each fruit purchased
appleTotalPrice = 0.0;
orangeTotalPrice = 0.0;
grapeTotalPrice = 0.0;
// use these to store the quantity of each fruit
int appleQty = 0;
int orangeQty = 0;
int grapeQty = 0;
// Step 1: Compute the total price of the grapes, apples,
//
and oranges.
[4 mark]
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// Step 2: Compute the regular discount.
[3 mark]
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// Step 3: Compute the privileged discount.
[2 mark]
// Step 4: Compute the actual discount & send to display_price.jsp
[3 mark]
%>
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- display_price.jsp // import the necessary packages used
[1 marks]
<html>
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<a href="point_of_sale.jsp">Go To Point-Of-Sale Page</a>
</html>
[2 marks]
Question: Explain things that need to be changed in order to make the application follow
the Model-View-Controller (MVC) architecture. Answer must fit within the box.
[4 marks]
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IS203 – Software Engineering
4. Git
I.
Jerry accidently deleted the app folder (and cleared his recycle bin) inside his IS203Project Git directory.
His pair programming partner suggests to clone a new copy (from the remote Git
server) of the entire SE project into a separate folder called IS203-Project-New and
use that for the pair programming session instead. Do you agree that this is a
possible solution? Explain your answer in one sentence.
In another sentence, explain what Jerry must do, if anything, to fix the IS203-Project
directory.
[3 marks]
Answer:
Circle one : Agree / Disagree
II.
Git is more useful for versioning binary files (.ppt, .jpg, .vpp, .pptx, .xlsx, .doc, .class)
compared to versioning text files (.java, .jsp, .txt, .html, .css). Do you agree/disagree?
Explain your reasoning in TWO or less sentences.
[3 marks]
Answer:
Circle one : Agree / Disagree
III.
Given the following scenario
1. Edward does a Git pull.
2. Fred does a Git pull.
3. Fred edits line 14 of question.txt.
4. Fred does a Git commit & Git push.
5. Edward edits line 12 of question.txt.
State the steps that Edward will take until his changes are pushed to remote Git repository
successfully. If any conflict is encountered, state whether TortoiseGit will resolve the
conflict automatically or is manual intervention is required.
[2 marks]
Answer:
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IV.
Using TortoiseGit, Kathy does a Git push and it fails. Hence, Kathy does a Git pull and
there is a merge conflict in problem.txt. Complete the steps below so that Kathy
resolves the conflict in a correct manner. You do not need to fill up all the steps.
[2 marks]
Answer:
1.
2.
3.
4.
Kathy closes the Git pull dialog.
TortoiseGit prompts "Do you want to see changes.
Kathy clicks "Yes".
TortoiseGIT displays the list of conflicts. For this case, there is only problem.txt
that has conflicts.
5.
6.
7.
8.
9.
10.
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