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Casual—informal paragraph format. Multiple paragraphs that cover vari ous scenarios. The prior Handle Returns example was casual. Use cases are text documents, not diagrams, and use-case modeling is primarily an act of writing text, not drawing. However, the UML defines a use case diagram to illustrate the names of use cases and actors, and their relationships. • fully dressed—the most elaborate. All steps and variations are written in detail, and there are supporting sections, such as preconditions and success guarantees.

Alternate Scenarios: If the credit authorization is reject, inform the customer and ask for an alternate payment method. If the item identifier is not found in the system, notify the Cashier and suggest manual entry of the identifier code (perhaps it is corrupted). If the system detects failure to communicate with the external tax calculator system, ... An alternate, but similar definition of a use case is provided by the RUP: A set of use-case instances, where each instance is a sequence of actions a system performs that yields an observable result of value to a particular actor [RUP].

Wants automatic and fast update of accounting and inventory. - Government Tax Agencies: Want to collect tax from every sale. May be multiple agen cies, such as national, state, and county. - Payment Authorization Service: Wants to receive digital authorization requests in the correct format and protocol. Wants to accurately account for their payables to the store. Preconditions: Cashier is identified and authenticated. Success Guarantee (Postconditions): Sale is saved. Tax is correctly calculated.

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