1. Business Analysis & Data Design ITEC-630 Spring 2008
Use Case Exercise
Solution
Professor J. Alberto Espinosa

2. Practice Example
We need to develop an order-processing system for a mail-order company that sells musical instruments of all sorts. Currently, the company has a paper catalog from which customers phone in or fax their orders and orders are only taken by hand. The proposed system should automate this process. It needs to allow customers to place orders by mail, phone, fax or directly through the web. Customers can pay with a money order or credit card. Customers can buy multiple items in various quantities with a single order. The system needs allow sales clerks to monitor the status of order fulfillment and notify customers when delays are anticipated. The system also needs to handle returns and cancellations. The system needs to interface with three existing external systems: (1) a Warehouse System – to send re-stocking orders to the central warehouse when necessary and to inquire about stock availability; (2) an Accounting System – to record customer receivables and pre-payments and inquire about customer payments; and (3) a Payment Processing system to process all charge card transactions. .

3. Context Diagram Example
Place or cancel orders, return merchandise & inquire catalog
Submit client check and credit
card payments
Payment Processing System
Customer
Receive approvals
Send notification of delays
Order Processing System
Re-stocking orders & inquire inventory availability
Place or cancel order on behalf of client & re-order merchandise
Upload customer receivables & pre-payments & inquire about customer payments
Sales Clerk
Warehouse System
Accounting System

4. Actor Specification Cards

5. Actor Specification
Actor Name: Customer
Type: Primary
Personality: Initiator
Abstract: No
Role Description:
It’s a person that wishes to place orders or cancel them
Actor Goals:
Purchase items
Cancel orders
Inquire catalog
Return items
Use Cases Involved with:

6. Actor Specification
Actor Name: Sales Clerk
Type: Primary
Personality: Proxy
Abstract: No
Role Description:
It’s a person that communicates with the customer when they are placing orders over the phone or via mail. This actor enters customers’ transactions on the system on their behalf, so this actor’s goals are the same as the customer’s goals
Actor Goals:
Purchase items
Cancel orders
Inquire catalog
Return items
Use Cases Involved with:

7. Actor Specification
Actor Name: Payment Processing System
Type: Secondary
Personality: External server
Abstract: No
Role Description:
This system is part of an existing payment system being updated to handle credit card and money order payments
Actor Goals:
None
Use Cases Involved with:
Purchase items
Cancel orders
Return merchandise

8. Actor Specification
Actor Name: Accounting System
Type: Secondary
Personality: External server
Abstract: No
Role Description:
This system is part of the existing accounting system which will receive information about receivables, payments and pre-payments to update the company’s books
Actor Goals:
None
Use Cases Involved with:
Purchase items
Cancel orders
Return merchandise

9. Actor Specification
Actor Name: Warehouse System
Type: Secondary
Personality: External server
Abstract: No
Role Description:
This system is part of the existing supply chain management system that manages the procurement of products and the company’s inventory.
Actor Goals:
None
Use Cases Involved with:
Re-Stock Inventory

10. Use Case Model

11. Initial Use Cases

12. Use Case Specification (shortened)
Use Case ID
UC-001
Use Case
Place an order directly via web
Actors
Customer, Payment Processing System
Description
Log on to the web site, enter password, select merchandise, place in shopping cart, pick more items, proceed to checkout, select payment method, process payment, exit.
Priority 1
Non-Functional Requirements
Assumptions
Source

13. Use Case Specification (shortened)
Use Case ID
UC-002
Use Case
Cancel order directly via web
Actors
Customer, Payment Processing System
Description
Log on to the web site, enter password, select merchandise purchased, and cancel order, if items have not been shipped yet, reverse charges as needed.
Priority 2
Non-Functional Requirements
Assumptions
Source

14. Use Case Specification (shortened)
Use Case ID
UC-003
Use Case
Return merchandise
Actors
Customer
Description
Log on to the web site, enter password, select merchandise purchased that will be returned, retrieve a return label with a return code
Priority 2
Non-Functional Requirements
Assumptions
Source

15. Use Case Specification (shortened)
Use Case ID
UC-004
Use Case
Inquire catalog
Actors
Customer, Sales Clerk, Warehouse System
Description
Log on to the web site (no password required to inquire catalog), select product category, present product display and price list
Priority 1
Non-Functional Requirements
Assumptions
Source

16. Use Case Specification (shortened)
Use Case ID
UC-005
Use Case
Place an order via mail, fax or phone
Actors
Sales Clerk
Description
Customer communicates with sales clerk via phone or sales clerk receives customer order via fax or mail, select merchandise ordered by the client, enter payment method and payment information.
Priority 1
Non-Functional Requirements
Assumptions
Source

17. Use Case Specification (shortened)
Use Case ID
UC-006
Use Case
Cancel order via fax, phone or mail
Actors
Sales Clerk
Description
Customer communicates with sales clerk via phone or sales clerk receives customer cancellation order via fax or mail, select merchandise purchased, and cancel order if items have not been shipped yet.
Priority 1
Non-Functional Requirements
Assumptions
Source

18. Use Case Specification (shortened)
Use Case ID
UC-007
Use Case
Return merchandise via sales clerk
Actors
Sales Clerk
Description
Customer communicates with sales clerk via phone or sales clerk receives customer merchandise return request via fax or mail, select merchandise purchased to be returned, print a return label with a return code, mail to customer
Priority 1
Non-Functional Requirements
Assumptions
Source

19. Use Case Specification (shortened)
Use Case ID
UC-008
Use Case
Re-order merchandise from inventory system
Actors
Sales clerk, Warehouse System
Description
Enter list of items and quantities to re-order from warehouse with shipping priorities
Priority 3
Non-Functional Requirements
Assumptions
Source

20. Use Case Specification (shortened)
Use Case ID
UC-009
Use Case
Update Accounting Data
Actors
Accounting System
Description
Download data from the system into the external Accounting System (i.e., receivables and pre-payments) and upload data from the external accounting system on customer payments
Priority 3
Non-Functional Requirements
Assumptions
Source

21. Base Use Cases

22. Place an order via web site Customer, Payment Processing System
Use Case ID
UC-001
Use Case
Place an order via web site
Actors
Customer, Payment Processing System
Description
Purchase
Pre-conditions
Customer has registered, customer logged in, main menu is displayed
Flow of Events
Browse catalog
Pick items to shopping cart
Indicate quantities for each item
Proceed to checkout
Select shipping method
Perform tax calculation
Display order details, with shipping and taxes
Customer OK’s transaction
Process payment
Thank you
Return to home page
Post-conditions
Main menu is displayed, log out customer after 20 min or inactivity
Alternative Flows
Allow for different shipping destinations
Etc.

23. Cancel order directly via web Customer, Payment Processing System
Use Case ID
UC-002
Use Case
Cancel order directly via web
Actors
Customer, Payment Processing System
Description
Customer selects an order not shipped yet and cancels it
Pre-conditions
Customer has registered, customer logged in, main menu is displayed
Flow of Events
Select cancel order option
Display list of orders placed by client, not shipped yet
Client selects order to cancel
Client confirms order cancellation
Reverse credit card charge or process refund
Thank you screen
Return to home page
Post-conditions
Main menu is displayed, log out customer after 20 min or inactivity
Alternative Flows
Priority
Non-Functional Requirements
Assumptions
Source

24. Customer has registered, customer logged in, main menu is displayed
Use Case ID
UC-003
Use Case
Return Merchandise
Actors
Customer
Description
Customer selects an order already shipped, requests a merchandise return, and gets a return reference number and label
Pre-conditions
Customer has registered, customer logged in, main menu is displayed
Flow of Events
Select return merchandise option
Display list of shipped orders for client, not more than 30 days old
Client selects order from which to return merchandise
Client selects specific items to return
Client confirms items to be returned
System gives client a return confirmation number
System gives client a printed label to affix in the return box
Thank you screen
Return to home page
Post-conditions
Main menu is displayed, log out customer after 20 min or inactivity
Alternative Flows
Priority
Non-Functional Requirements
Assumptions
Source

25. Customer, Sales Clerk, Warehouse System
Use Case ID
UC-004
Use Case
Inquire Catalog
Actors
Customer, Sales Clerk, Warehouse System
Description
Customer or sales clerk browse product catalog on-line
Pre-conditions
Customer has registered, customer logged in, main menu is displayed
Flow of Events
Display catalog browsing options (by brand, type, price, etc.)
Product catalog is displayed
Prompt customer for other display options or exit catalog
Return to home page when exit option is chosen
Post-conditions
Main menu page is displayed, log out customer after 20 min or inactivity
Alternative Flows
Priority
Non-Functional Requirements
Assumptions
Source

26. Etc. Other use cases?

27. Customer or sales clerk log into the system and get authenticated
Use Case ID
UC-010
Use Case
Log in
Actors
Customer, Sales Clerk
Description
Customer or sales clerk log into the system and get authenticated
Pre-conditions
Login page is displayed when the customer accesses the system
Flow of Events
Customer enters ID and password
System verifies that customer is valid
System matches password entered against password on file
Authenticate the customer
Retrieve basic customer data from files
Display personalized greeting for the customer
Display home page
Post-conditions
Main menu is displayed, log out customer after 20 min or inactivity
Alternative Flows
Priority
Non-Functional Requirements
Assumptions
Source

28. Customer selects option to register
Use Case ID
UC-011
Use Case
Register
Actors
Customer, Sales Clerk
Description
New customer registers in the system, or sales clerk does the same on his/her behalf
Pre-conditions
Login page is displayed (it contains option to register for new customers)
Flow of Events
Customer selects option to register
Customer enters required information (name, shipping address, etc.)
Customer enters password
Customer submits information
Display thank you note and successful registration message
Display option to proceed to log in
Return to login page
Post-conditions
Login page is displayed
Alternative Flows
Priority
Non-Functional Requirements
Assumptions
Source