Business Process and Functional Modeling

Business Process and Functional Modeling transforms requirements into logical models that describe how a business system interacts with its environment. These models are implementation-independent, meaning they focus on what the system does rather than how it does it.

Use Case Diagrams

Use case diagrams illustrate how a system interacts with its environment through discrete activities.

The main elements include:

1. Actors
   • Users or other systems that interact with the system
   • Represented by stick figures
2. Use Cases
   • Major processes that provide benefits to users
   • Represented by ovals and named with verb phrases
3. Relationships
   • Association
     Basic interaction between actor and use case
   • Include
     One use case includes functionality of another
   • Extend
     Optional behavior extension
   • Generalization
     Specialized version of another use case
4. Subject Boundary
   • Named box showing system scope
   • Contains all use cases

Use Case Descriptions

1. Overview Section
   • Name
   • Primary actor
   • Brief description
   • Stakeholders
   • Triggers
2. Relationships Section
   • Association relationships
   • Include relationships
   • Extend relationships
   • Generalization relationships
3. Flow of Events
   • Normal Flow: Main success scenario
   • Sub-flows: Decomposed normal flows
   • Alternate/Exceptional Flows: Alternative scenarios

Activity Diagrams

Activity diagrams show the sequence of activities in a business process, independent of objects.