Use case Diagram

Object Oriented Design and Analysis
Use Case Diagram
PRESENTED BY : -
MURLIMOHAN KANDIKATLA
RAHUL POLA

CONTENTS
What is Use-Case Diagram
Purpose

Introduction
Use-cases are descriptions of the functionality of a system from a
user perspective.

Depict the behaviour of the system, as it appears to an outside user.

Describe the functionality and users (actors) of the system.

Show the relationships between the actors that use the system, the
use cases (functionality) they use, and the relationship between
different use cases.

Document the scope of the system.

Illustrate the developer’s understanding of the user’s requirements.

Use Case Diagram, purpose
Use case models are developed at different levels of abstraction
system, system component, or a class.
Use case modelling is an iterative and incremental process.
If user requirements change, the changes should be made in all the affected documents.
Requirements
document
(text in natural language)
Class
diagrams
Activity
diagrams
Sequence
diagrams
Statechart
diagrams

Use Case diagrams, basic UML notation
 Use Case: A Use Case is a description of a set of
interactions between a user and the system.
 Components of use case diagram:
 Actor
 Use case
 System boundary
 Relationship
use case name
use case name
use case name

ACTOR
 An actor is some one or something that must
interact with the system under development
 Actors can be human or automated systems.
 Actors are not part of the system.
 UML notation for actor is stickman, shown below.
Student Faculty Employee

Primary and Secondary Actors
Primary Actor
Acts on the system
Initiates an interaction with the system
Uses the system to fulfill his/her goal
Events Something we don’t have control over
Secondary Actor
Is acted on/invoked/used by the system
Helps the system to fulfills its goal
Something the system uses to get its job done

External Hardware And Other
Systems
• External Hardware
– It is the hardware device
– It is the part of an application
– Uses the system to fulfill his/her goal
• Other Systems
– Is acted on/invoked/used by the system
– Helps the system to fulfills its goal
– The system with which system interacts

USE CASE
What is USE case?
 A use case is a pattern of behavior, the system
exhibits
 The use cases are sequence of actions that the
user takes on a system to get particular target
 USE CASE is dialogue between an actor and the
system.
• Examples: Add a course

System Boundary
 It is shown as a rectangle.
 It helps to identify what is external versus internal, and
what the responsibilities of the system are.
 The external environment is represented only by actors.

Relationship
Relationship is an association between use case and actor.
There are several Use Case relationships:
 Include
 Extend
 Association
 Dependency
 Generalization

Include Relationship
 Include relationships insert additional behavior into a base use
case
 use cases that are included as parts of other use cases. Enable to
factor common behavior.
 They are shown as a dotted line with an open arrow and the key
word <<include>>

Extend Relationship
 The extended relationship is used to indicate that use case
completely consists of the behavior of another use case at one or
specific point
 use cases that extend the behavior of other core use cases.
Enable to factor variants
 It is shown as a dotted line with an arrow point and labeled
<<extend>>
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Use case Diagram

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