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Using SUCD to Describe Use Cases

Using SUCD to Describe Use Cases. ECE 621. Authoring Styles. Many authoring styles exist Tailored for specific domains Real-Time systems Safety critical systems Most authoring styles use templates Overwhelming majority only use unstructured natural language Very little structure. SUCD.

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Using SUCD to Describe Use Cases

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  1. Using SUCD to Describe Use Cases ECE 621

  2. Authoring Styles • Many authoring styles exist • Tailored for specific domains • Real-Time systems • Safety critical systems • Most authoring styles use templates • Overwhelming majority only use unstructured natural language • Very little structure

  3. SUCD • Provides rigor • Helps clarify the flow of use cases • Helps avoid common mistakes • Can be used to automatically generate the corresponding use case diagrams, hence ensures consistency

  4. Headers an actions Actions The Actor • {BEGIN enter member information} • Librarian enters member’s name • Librarian enters member’s address • Librarian enters member’s phone number • {END enter member information} The Same A Header

  5. Basic Flow {BEGIN Use Case} … Headers and Actions …. {END Use Case} Reserved only for the Basic Flow

  6. Alternative Flow The Header in the Basic Flow AT {enter ticket order information} • PERFORM search tickets IF tickets not available … Headers and Actions … The action in that header from the Basic Flow The condition

  7. Subflows Subflow name SUBFLOW print receipt {BEGIN print transaction information} • SYSTEM prints Customer information • SYSTEM prints team hockey card information • SYSTEM print items information and total price {END print transaction information}

  8. Extension Points – At The Base Use Case Extension Points: PUBLIC EXTENSION POINT Grand Prize Giveaway Name of the extension point

  9. Extension Points – At The Extension Use Case Name of the extended UC PUBLIC EXTENSION POINT BEHAVIOR EXTENDING {Buy Team Merchandise : Grand Prize Giveaway} FLOW Basic Flow AT {a chance to win} IF winning ticket was entered {BEGIN grand prize giveaway} • SYSTEM notifies Customer the he/she won the grand prize • Customer enters phone number for a Customer service representative to call {END grand prize giveaway} CONTINUE {END Use Case} Name of the extension Point The flow inside the base UC Where to continue at base UC

  10. Abstraction, Implementation and Specialization • Keywords used in the Name section: • ABSTRACT • IMPLEMENTS • SPECIALIZES

  11. More Keywords (2) • INCLUDE – to perform an inclusion UC • PERFORM – to performed a Subflow • RESUME – what to perform next • AFTER – what needs to be performed first • AT/IF – what condition to evaluate and where • BEGIN/END – • PUBLIC EXTENSION POINT – at the base UC • PUBLIC EXTENSION POINT BEHAVIOR – at the extension UC • PRIVATE EXTENSION POINT – private to the UC • FLOW – which flow in the base UC • CONTINUE – where to go back in the base UC

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