SEQUENCE DIAGRAMS AND DESIGN CLASS DIAGRAMS

Page 1 of 4

ASSIGNMENT 4

SEQUENCE DIAGRAMS AND DESIGN CLASS DIAGRAMS

Weight: 15% of the total course grade

Due: Week 10

All parts of your assignment should be submitted in Week 10. Use the following

sequence:

Start Part A after you have completed Unit 5.

Start Part B after you have completed Part A of this assignment.

Start Part C after you have completed Part B of this assignment.

You need to achieve a mark of at least 50% on each assignment to pass

COMP 361.

REFERENCES

 Study Guide Unit 5

DELIVERABLES

This assignment requires that you develop and submit the following items for

selected aspects of the proposed Car Sharing IS:

1. Design class diagram

2. First-cut sequence diagram

3. Multilayer design for sequence diagram

 Text should be submitted in MS-Word (or Word-compatible) or PDF (or PDF-

compatible) format.

 Diagrams must be prepared using one of the software tools suggested in Unit 0.

If you would like to use another tool, you have to ask your tutor before you start

with this assignment!

Page 2 of 4

 If the diagrams are small (smaller than one page) you may paste them into a

Word or PDF file instead of submitting a .gif or .jpg file. Make sure the diagrams

are readable!

Before you proceed, check the COMP 361 General Discussion Forum for any

clarifications, modifications, or other news regarding this assignment.

Make sure you have received feedback from your tutor on Assignment 3

before you complete Assignment 4, since misunderstandings and mistakes in

Assignment 3 would automatically lead to mistakes in Assignment 4.

DETAILED DESCRIPTION AND REQUIREMENTS

PART A: DESIGN CLASS DIAGRAM AND SEQUENCE DIAGRAMS

1. Create a preliminary version of the design class diagram (first-cut design class

diagram) for the Car Sharing IS. This requires that you (a) elaborate class

attributes, and (b) add navigation visibility arrows (see pp. 308–314 in the

textbook). See Figure 10-16 on p. 314 of the textbook for an example of the

output of this step. Do not submit the first-cut design class diagram from

the textbook!

2. Develop first-cut sequence diagrams to explain object interactions for the “Make

Reservation through Web Interface” use case (see pp. 332–344) of the

textbook, and follow the “Guidelines and Assumptions for First-Cut Sequence

Diagram Development” on p. 344.

3. Develop a multilayer design for the “Make Reservation through Web Interface”

use case. Follow the process in “Developing a Multilayer Design” on pp. 345–349

of the textbook.

4. Update the design class diagram by adding method signatures. Don’t forget to

include all methods (see discussion on pp. 351–353 of the textbook) and any

controller classes required. See Figure 11-18 on p. 352 for an example of what

is required.

Part A is worth 80 marks. Marking criteria are completeness and correctness of

 sequence diagrams (40 marks)

o controller, boundary/view, data access classes (16 marks)

o methods – signatures, data passed/returned (8 marks)

o interactions – describe scenario completely and correctly (16 marks)

 design class diagram (40 marks)

o attributes (8 marks)

Page 3 of 4

o visibility – navigation (8 marks)

o methods (16 marks)

o controller classes (8 marks)

The organization and presentation of information are part of the interpersonal and

communication skills required of systems analysts.

PART B: ESSAY QUESTION

The design phase includes the development of several diagrams. Explain why that

many diagrams are needed and what the purpose/value of each of them is. Make

sure that your description clearly states the need for each diagram and that it is

therefore clear how this diagram is different from others.

Answer the questions above, using overall 300–400 words. Being able to answer

questions precisely is part of the interpersonal and communication skills required of

systems analysts; therefore, meeting the word limit is important.

Answers consisting of more than 400 words will be marked with 0 points, and

answers of less than 300 words will receive reduced marks proportionate to

the length of the answer.

Make sure that your answer is written in your own words rather than being copied

either from the textbook or from another source! Cite the sources you use in your

answer, and provide references. There should be at least two references in your

answer, and at least one of them should not be the textbook. If you are not sure

how to list and cite sources, please read “How to Cite Correctly” in the Important

Resources block on the right side of the course home page.

Part B is worth 10 marks. Marking criteria are

 completeness and correctness (9 marks)

 presentation – readability, use of references, etc. (1 mark)

The organization and presentation of information are part of the interpersonal and

communication skills required of systems analysts.

PART C: REFLECTION ON THE ACTIVITIES OF THE ASSIGNMENT

In this part of the assignment, you are asked to reflect on the activities that you

have completed for Assignment 4. Use your blog to reflect on your problems,

insights, and contributions during and after your task-related activities. For

example, you could ask yourself the following questions: What was easy and what

was difficult in this assignment? What causes/caused me problems (and why)?

Which solutions or approaches have I found/tried that could also be useful for my

colleagues? Where was I unable to find a solution (and why)? How do/did I

approach the current problem? etc.

Page 4 of 4

Do not include any concrete, specific solutions from your assignment in

your reflection message! The goal of this activity is to write and reflect from a

generic point of view rather than discussing concrete solutions!

The minimum requirement for this assignment is one blog posting of at least of

300 words. You are, of course, encouraged to post longer messages as well as

more often!

Post your message to your blog on The Landing and also upload a copy of your

posting for Assignment 4.

Part C is worth 10 marks. Marking criteria are

 level of reflection (9 marks)

 presentation – readability, etc. (1 mark)