week 10 object modeling 1 use case model
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MSIS 670: Object-Oriented Software Engineering. Week 10: Object Modeling (1)Use Case Model. Figure 1: UML Models using Use-Case Driven Approach (Rosenburg, 1999). Performing Object Oriented Analysis (OOA).

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performing object oriented analysis ooa
Performing Object Oriented Analysis (OOA)
  • OOA requires that we identify the objects, their data attributes, associated behavior, and relationships which support the required business system functionality.
  • We perform object modeling to document the identified objects, the data and behavior they encapsulate, plus their relationships with other objects.
performing ooa cont
Performing OOA (cont.)
  • Two general activities when performing object oriented analysis:
    • Gathering requirements through use case analysis
    • Finding and identifying the business objects.
    • Organizing the objects and identifying their relationships in class diagrams
gathering requirements
Gathering Requirements
  • A system’s requirements consist of a document (or a collection of documents) that describes the functionality that system provides.
    • Use case models show discrete groups of system users as they interact with the system.
dynamic modeling use case model
Dynamic Modeling: Use Case Model
  • Use case modeling breaks down the entire scope of system functionality into many smaller statements of system functionality called use cases or business events.
    • Ause case: a behaviorally related sequence of steps (a scenario), both automated and manual for the purpose of completing a single business task.
developing use case diagrams
Developing Use Case Diagrams
  • Identify actors
  • Determine how these actors will get value from the system
  • Provide a simple and accessible view of the users and their use of the system
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A

B

C

D

E

F

relationships between use cases
Relationships Between Use Cases
  • Communicates

b. Uses

c. Extends

use of includes and extends relationships
Use of Includes and Extends Relationships
  • Includes (uses): the base (abstract) use case depends on the included use case because it absorbs its behavior
  • Extends: the base (abstract) use case does not include the subordinate use case, instead, the extension use case depends on the base use case
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