agarwal-UseCases.pdf · • Use cases: use case talks about the funcDonality of the system from an individual perspecDves •

Transcript

Page 1: Use Cases - Encsusers.encs.concordia.ca/~gregb/home/PDF/agarwal-UseCases.pdf · • Use cases: use case talks about the funcDonality of the system from an individual perspecDves •

Use Cases Preparedby:SoniaAgarwal

Course:Comp354January2018

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Use Case Modelling

• Usecasemodellinghelpsustounderstandwhatoursystemis• Usecasemodellingconsistoftwoparts:• Usecases• Usecasediagram

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Use case diagram

• Usecasediagramconsistofthreeimportantparts:•  Systemboundary:whichtellsusthescopeoftheapplicaDon• Usecases:usecasetalksaboutthefuncDonalityofthesystemfromanindividualperspecDves• Actors:ActorsareindividualrolesthatpeopleplayorindividualswhousethisapplicaDon.

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Use Case Diagram

Page 5: Use Cases - Encsusers.encs.concordia.ca/~gregb/home/PDF/agarwal-UseCases.pdf · • Use cases: use case talks about the funcDonality of the system from an individual perspecDves •

Use Case Template

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Defini7on of Use Case

• UseCaseisadescripDonofthepossiblesequencesofinteracDons,betweenthesystemunderdiscussionanditsexternalactors,relatedtoaparDculargoal.

• OR

•  EachUsecaseisSequenceofac+onsasystemperformsthatyieldsanobservableresultsofvaluetoapar+cularactor

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Use Case Model

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Main success Scenario

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Extensions

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Por>olio Management

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Execu7on of Use Case

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Alterna7ve flows

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Business Rules

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Thankyou

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