Use Case Diagrams Harish Alwala

Harish Alwala

Words to know Use case Actor <<extend>> <<include>> Generalization & Specialization

Use case

Actor

<<extend>>

<<include>>

Generalization & Specialization

What does each mean? Use Case: Use cases are descriptions of the functionality of the system from users’ perspective. Use case diagrams, like sequence diagram, collaboration diagram & Activity Diagram, in UML are diagrammatical representation of the requirements of the system from users’ perspective. They also define scope of requirements.

Use Case:

Use cases are descriptions of the functionality of the system from users’ perspective.

Use case diagrams, like sequence diagram, collaboration diagram & Activity Diagram, in UML are diagrammatical representation of the requirements of the system from users’ perspective.

They also define scope of requirements.

What does each mean? Actor: Actor represent the role that take on when communication with particular use cases in the system An Actor initiates process. An Actor can be a person, devise or system

Actor:

Actor represent the role that take on when communication with particular use cases in the system

An Actor initiates process.

An Actor can be a person, devise or system

What does each mean? <<extend>> A Stereotype used to show the use case that provides additional functionality that may be required in another use case. Eg: Print Summary use case is extension for Display summary use case Display supplementary card summary use case for Display Basic card summary use case

<<extend>>

A Stereotype used to show the use case that provides additional functionality that may be required in another use case.

Eg:

Print Summary use case is extension for Display summary use case

Display supplementary card summary use case for Display Basic card summary use case

What does each mean? <<include>> A Stereotype used when there is a sequence of behavior that is used frequently in a number of use cases Eg: Find Book is common use case used to Check Availability use case and Book for future use case in Library computerization system Identify Requester is common use case used to Penalize Student & Issue A Book use case

<<include>>

A Stereotype used when there is a sequence of behavior that is used frequently in a number of use cases

Eg:

Find Book is common use case used to Check Availability use case and Book for future use case in Library computerization system

Identify Requester is common use case used to Penalize Student & Issue A Book use case

What does each mean? Generalization & Specialization: The generalization link is an informal way of showing that one use case is similar to another use case, but with a little bit of extra functionality. One use case inherits the functionality represented by another use case and adds some additional behavior to it. Eg: Two actors, Staff Contact and Campaign Manager and a Campaign Manager can do everything that a Staff Contact can do, and more. Campaign Manager use case is a specialization of Staff Contact Inheritance functionality of Campaign Manager over Staff Contact is Generalization .

Generalization & Specialization:

The generalization link is an informal way of showing that one use case is similar to another use case, but with a little bit of extra functionality.

One use case inherits the functionality represented by another use case and adds some additional behavior to it.

Eg:

Two actors, Staff Contact and Campaign Manager and a Campaign Manager can do everything that a Staff Contact can do, and more.

Campaign Manager use case is a specialization of Staff Contact

Inheritance functionality of Campaign Manager over Staff Contact is Generalization .

Extension… Manage Team Do Coding End to End Project Management Billability Mgmt PM TL

Example Library Computerization Format to document each Use Case Name of the Use Case Pre-Condition Post Condition Purpose Description Use Cases Diagrams

Library Computerization

Format to document each Use Case

Name of the Use Case

Pre-Condition

Post Condition

Purpose

Description

Use Cases Diagrams

Example Name of the Use Case Student / Staff Register to Library Search for the required book Book Reservation Check for availability Staff Suggest to buy a book Administrator Organize books Organize Library Registered members Issue books Penalize the user Raise invoice for new books

Name of the Use Case

Student / Staff

Register to Library

Search for the required book

Book Reservation

Check for availability

Staff

Suggest to buy a book

Administrator

Organize books

Organize Library Registered members

Issue books

Penalize the user

Raise invoice for new books