Subscribers can select an alternate theme (or "skin") for the application.
Trillian finds the default presentation style of the MailReader a bit plan. She returns to the Profile page and selects one of the alternate "skins".
|| Adjust presentation style according to individual Subscriber preference
|| User Goal
|| (User Goal, Summary, Subfunction)
|| Subscriber selects an alternate skin
Main Success Scenario (MSS)
|| Subscriber opens Profile page.
|| System presents Profile optins, including choice of "skin".
|| Subscriber selects an alternate skin.
|| System stores preference and presents pages according to the new settings.
Preconditions and Guarantees
|| Client is authenticated
| Success Guarantees
|| Preferred presentation style is utilized for Subscriber