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SYS466. Systems Use Case Specifications. Systems Use Case Diagrams and Specifications. Based on the dialog metaphor. Dialog Expresses that the User and Computer Interact by Sending Messages. Designing Dialogs.

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SYS466


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sys466
SYS466

Systems Use Case Specifications

designing dialogs
Designing Dialogs
  • The process of designing the overall sequences that users follow to interact with an information system
  • the sequence in which information is displayed to and obtained from the user
sequence
Sequence
  • understanding how the user will interact with the system
    • clear understanding of user, task, technological and environmental characteristics
questions to ask to identify system use cases
Questions to ask to identify system use cases*
  • What are users in this role trying to accomplish?
  • To fulfill this role, what do users need to be able to do?
  • What are the main tasks of users in this role?
  • What information do users in this role need to examine, create, or change?
  • What do users in this role need to be informed of by the system?
  • What do users in this role need to inform the system about?

*http://www.agilemodeling.com/artifacts/systemUseCase.htm

systems use case diagram
Systems Use Case Diagram
  • Place holder for the Systems Use Case Specification
  • A visual index, providing a context for the Specifications

*Systems Use Cases Modeling by Bittner & Spence, Pages 153 - 154

systems use case specifications
Systems Use Case Specifications
  • The (systems) use case specifications provide the substance of the (systems) use case model and they are the basis for most of the …modeling work…More than 90% of the (systems) use-case model lies beneath the surface, in the textual use-case specifications themselves. *

*Use Case Modeling, Kurt Bittner & Ian Spence, Addison-Wesley, 2003, p. 30

systems use case specifications1
Systems Use Case Specifications
  • “(Systems) use cases are more than just a named ellipse and a brief Specification. For each (systems) use case there will also be a (systems) use-case specification where the full story of the use case is told.”*

*Use Case Modeling, Kurt Bittner & Ian Spence, Addison-Wesley, 2003, p. 30

systems use case specifications2
Systems Use Case Specifications
  • “The use case specification tells a story of how a system and its actors collaborate to achieve a specific goal
  • This collaboration takes the form of a dialog between the system and its actors
  • It is a step-by-step description of a particular way of using a system”*

*Use Case Modeling, Kurt Bittner & Ian Spence, Addison-Wesley, 2003, p. 24

systems use case specification
Systems Use Case Specification
  • Not a complete specification of all possible ways that some task is performed
  • Describes typical ways (or scenarios) of using the system*

*Use Case Modeling, Kurt Bittner & Ian Spence, Addison-Wesley, 2003, pp. 24-25

wikpedia explanation of use cases and use case specifications
WIKPEDIA EXPLANATION OF USE CASES AND USE CASE SPECIFICATIONS
  • An excellent explanation of use cases and use case specifications
systems use case specifications3
Systems Use Case Specifications
  • Discussion of formal and informal use case specifications – Ambler
  • Discussion of the essential use case specification - Ambler
systems use case specifications4
Systems Use Case Specifications
  • The systems use case specification must include:
    • Who the actors are and how many of them are interacting with the system at any point in time
    • What data is used and how
    • All normal logic
the use case specification
The Use Case Specification
  • One of the best checks of whether a use case specification is finished is to ask if you could use the use case to derive system tests.
  • The best way to tell if the use cases fit the purpose is to pass them along to the…test team for test design.
  • If the team is satisfied that they can use the use cases to support this activity, then the use case specifications contain sufficient levels of detail.