Business

Session 6: Object Modeling

Preview

In the last session, you used data and process modeling techniques to develop a logical model of the new system. Now you will apply your object modeling skills to create various diagrams and documentation for the new TIMS system. You will review the background material and develop an object-oriented model that includes several types of diagrams.

Tasks

1. I need to review Jesse’s e-mail message regarding object modeling and the JAD session summary. I need to identify possible use cases and actors, and create a use case diagram for the TIMS system.

Possible use cases might include Student Payment, Register, Request Course, Teach Course, Determine Schedule, and Maintain Training Records. Possible actors might include Student, Instructor, Training Administrator, and Corporate Client. A sample use case diagram for Determine Schedule, Register, and Prepare Training Report follows:

2. She wants me to create a model of the use case that shows how students register. She also wants to see a class diagram.

A sample class diagram for the Register use case follows:

Student

Student number

Name

Address

SSN

Request course

Add course

Complete course

Drop course

Change student data

0..*

0..*

Registration Record

Student number

Course number

Payment method

Tuition due

Registers

Determine tuition

Prepare roster

Confirm

1..*

Includes

1..*

Course

Course number

Course name

Instructor

Day/Time

Add Course

Change Course

Delete Course

Instructor

Instructor ID

Name

Courses qualifications

Location

Phone

Teach course

Report outcome

Teaches

1..*

1

1

Updates

Training Record

Student number

Course number

Date

Completion data

Output to SCR staff

Output to student

Output to corporate client

3. I need to create a sample registration sequence diagram that shows the steps in the registration process.

Sample Registration Sequence Diagram:

Requests Course

Confirms Available

Schedules

Student

Registration

Courses

Checks Availability

Confirms

Notifies

Payment

Instructor

Bill

4. Jesse asked me to create a state transition diagram that describes typical student states and how they change based on certain actions and events. She said to include a brief cover memo.

Possible use cases might include Student Payment, Register, Request Course, Teach Course, Determine Schedule, and Maintain Training Records. Possible actors might include Student, Instructor, Training Administrator, and Corporate Client. A sample use case diagram for Determine Schedule, Register, and Prepare Training Report follows:

RULES 1 2 3 4 5 6 7 8
Multiple courses? Y Y Y Y N N N N
Employed by SCR client? Y Y N N Y Y N N
Client service rep waiver? Y N Y N Y N Y N
Eligible for discount A X X X X
Eligible for discount B X X X X X X
Not eligible for discounts X

Simplified rules:

RULES 1 2 3 4 5 6
Multiple courses? Y Y Y N N N
Employed by SCR client? Y N N Y N N
Client service rep waiver? Y N Y N
Eligible for discount A X X X
Eligible for discount B X X X X
Not eligible for discounts X

A sample decision tree follows:

Multiple courses

Client service rep override?

Not eligible for discounts

Eligible for discount B

Eligible for discount B

Eligible for discount A

Eligible for discount A and B

Eligible for discount A and B

Employed by SCR client?

Employed by SCR client?

Yes

Yes

No

No

Client service rep override?

No

No

Yes

Yes

No

Yes

Bills

Bills

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