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Understanding Use Case Diagrams: Concepts, Identification, and Creation Process

This guide covers the essential aspects of use case diagrams and their role in identifying business processes. It focuses on understanding the methodologies to convert requirements into functional models, detailing how a system interacts with its users and environment. You'll learn about different components of use case diagrams, including actors, associations, and subject boundaries. The guide further explains the steps to create accurate and effective use case diagrams, illustrated through an example of a library circulation system, and provides links to supplementary video resources for deeper understanding.

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Understanding Use Case Diagrams: Concepts, Identification, and Creation Process

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Presentation Transcript

  1. Use Case Diagrams IST 420 Dr. Ocker

  2. Learning Objectives • Understand the process used to identify business processes and use cases. • Understand the process used to create use-case diagrams

  3. Introduction • Now begin the process of turning the requirements into functional models • Models are logical; i.e., independent of how they are implemented (manual or computerized) • Develop use-cases from the requirements • Use-case: how a system interacts with its environment • Includes a diagram and a description to depict the discrete activities that the users perform • Develop activity diagrams from the use-cases • These model the business processes or how a business operates • Used to illustrate the movement of objects (data) between activities

  4. Business Process Identification With Use-Cases • Elements of Use-Case Diagrams • Actors: users or and other interacting systems • Associations: lines to connect actors and use-cases • Interactions, inclusions, extensions or generalizations • Use-case: a major process in the system that gives a benefit to the users • Subject boundary: a named box that depicts the scope of the system

  5. Identifying Major Use-Cases • Review the requirements definition • Identify the subject’s boundaries • Identify the primary actors and their goals • Identify the business processes and major use-cases • Carefully review the current set of use-cases • Split or combine some to create the right size • Identify additional use-cases

  6. Create a Use-Case Diagram • Place & draw the use-cases • Place & draw the actors • Draw the subject boundary • Add the associations

  7. Example Use-Case • Library circulation system

  8. use cases and actors • Relationship between use cases and actors  an actor can use a certain functionality of the business system • No information on chronological sequence

  9. View the UML videos • View the videos • Each one is only a few minutes and WELL WORTH your time • Also review Creating a Use Case diagram for Ebay steps 1-5 (link provided)

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