Summary of lecture - 6

Use Case modeling
What is use case modeling?
This is a graphical model that represents the users with system involvement
Relationships between usecase
Documents situation where one use case requires the services of a common
subroutine
• Another use case is developed for this common subroutine
• A common use case can be reused by multiple use cases
What is Activity diagram?
Diagram showing business process activities.
Ex - UML Diagram, usecase diagram and sequence diagram
SSD lifelines

Vertical line under object or actor:
– Shows passage of time
• If vertical line dashed:
– Creation and destruction of thing is not important for scenario
• Long narrow rectangles:
– Activation lifelines emphasize that object is active only during part of scenario
Domain model class diagram
This provides definition of system components and contains important class information for implementation as well as conceptual data model.
Object-oriented approach has complete set ofdiagrams that together document the user’sneed and define system requirements• Requirements specified using followingmodels:– Domain model class diagrams– Use case diagrams– Use case detailed model, either descriptive format oractivity diagram– System sequence diagrams (SSDs).