AUUse Case ExerciseSolution

Professor J. Alberto Espinosa

Business Analysis &Data Design

ITEC-630 Spring 2008

22

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.

.

33

Context Diagram Example

OrderProcessing

System

Customer

Sales Clerk

PaymentProcessing

System

WarehouseSystem

Place or cancelorders, return merchandise & inquire catalog

Send notificationof delays

Submit clientcheck and credit card payments

Place orcancel order

on behalf of client &

re-ordermerchandise

Re-stocking orders &inquire inventory availability

AccountingSystem

Uploadcustomer

receivables &pre-payments &

inquire aboutcustomer payments

Receiveapprovals

44

Actor Specification Cards

55

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: Purchase items Cancel orders Inquire catalog Return items

66

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: Purchase items Cancel orders Inquire catalog Return items

77

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

88

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

99

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

1010

Use Case Model

Customer

Sales Clerk

Accounting System

Warehouse System

Payment Processing System

Order Processing System

UC-001 Place WebOrders

UC-002 CancelOrders (Web)

UC-003 ReturnMerchandise (Web)

UC-004 InquireCatalog

UC-005 Place Mail,Fax or Phone Orders

UC-006 Cancel Orders(Mail, Fax, or Phone)

UC-007 ReturnMerchandise (Mail, Fax or Phone)

UC-008 PlaceRe-Stocking Order

UC-009 UpdateAccounting Data

1111

Initial Use Cases

1212

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

1313

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

1414

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

1515

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

1616

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

1717

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

1818

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

1919

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

2020

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

2121

Base Use Cases

2222

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 1. Browse catalog2. Pick items to shopping cart3. Indicate quantities for each item4. Proceed to checkout5. Select shipping method6. Perform tax calculation7. Display order details, with shipping and taxes8. Customer OK’s transaction9. Process payment10. Thank you11. 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.

2323

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 1. Select cancel order option2. Display list of orders placed by client, not shipped yet3. Client selects order to cancel4. Client confirms order cancellation5. Reverse credit card charge or process refund6. Thank you screen7. 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

2424

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 1. Select return merchandise option2. Display list of shipped orders for client, not more than 30 days old3. Client selects order from which to return merchandise4. Client selects specific items to return5. Client confirms items to be returned6. System gives client a return confirmation number7. System gives client a printed label to affix in the return box8. Thank you screen9. 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

2525

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 1. Display catalog browsing options (by brand, type, price, etc.)2. Product catalog is displayed3. Prompt customer for other display options or exit catalog4. 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

2626

Etc.Other use cases?

2727

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 1. Customer enters ID and password2. System verifies that customer is valid3. System matches password entered against password on file4. Authenticate the customer 5. Retrieve basic customer data from files6. Display personalized greeting for the customer7. 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

2828

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 1. Customer selects option to register2. Customer enters required information (name, shipping address, etc.)3. Customer enters password4. Customer submits information5. Display thank you note and successful registration message6. Display option to proceed to log in7. Return to login page

Post-conditions Login page is displayed

Alternative Flows

Priority

Non-Functional Requirements

Assumptions

Source