Use Case Template

Use case template

A. use case

Primary Actor:

Stakeholders and Interests:

• Customer: Wants to buy a product ...
• Website owner: Wants to sell stuff and receive the correct payments.
• Payment Authorization service: Wants correct payment information ...

Preconditions: Customer is logged in on website

Success Guarantee (Postconditions): Sale is saved, payment information is registered, ...

Main Success Scenario (or Basic Flow):

1. Customer browses through catalog and selects items to buy
2. Customer goes to check out
3. Customer fills in shipping information (address; next-day or 3-day delivery)
4. System presents full pricing information, including shipping
5. Customer fills in credit card information
6. System authorizes purchase
7. System confirms sale immediately
8. System sends confirming email to customer

Extensions (or Alternative Flows)

• 3a. System already knows customer (registered customer)
  • 1. System displays current shipping information, pricing information, and last four digits of credit card information
  • 2. Customer may accept or override these defaults
  • 3. Return to primary scenario at step 6
• 6a. System fails to authorize credit purchase
  • 1. Allow customer to re-enter credit card information and retry
  • 2. Return to primary scenario at step 6