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Use Case Diagram
by:
Dr. Bharat V. Chawda
Computer Engineering Department,
BBIT, VVNagar, Gujarat, India
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2.
Overview
 Introduction
 Notations
 Example
 Use Case Model
 Why Use Case Diagram?
(As per GTU Curriculum – Diploma in Computer/IT Engineering)
Based on Book:
1. Fundamentals of Software Engineering – by Rajib Mall
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Use case diagram: Example
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Manage Books
Manage Customers
Manage Suppliers
Manage Employees
Manage Purchase
Manage Sales
Search Books
Book store Management System
Admin
Customer
Login

4.
Concept
 Use Case
 Represents the way in which a system can be
used by users.
 Corresponds to high level functional req.
 Do not reveal internal structure of the system.
 Shows interactions between user & system.
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5.
Use case diagram: Notations
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Stick Person Actor
Ellipse
Rectangle
Line
Use Case
System Boundary
Communication Relationship

6.
Use case diagram: Example (i)
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Manage Books
Manage Customers
Manage Suppliers
Manage Employees
Manage Purchase
Manage Sales
Search Books
Book store Management System
Admin
Customer
Login

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Use case diagram: Example (ii)
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Manage Books
Manage Customers
Manage Suppliers
Manage Employees
Manage Purchase
Manage Sales
Search Books
Book store Management System
Admin
Login
Sales
Manager
Purchase
Manager
Customer

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Use Case Model
 Use case diagram + Text description
 Contact Persons
 Actors
 Pre-condition
 Post-condition
 Non-functional Requirements
 Exceptions, Error situations
 Sample Dialogs
 Specific User Interface Requirements
 Document References
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Why Use case diagram?
 Helps to identify/analyze requirements
 Helps to identify actors
 Serves as a type of requirements
specification
 Useful in understanding exact functioning
of the system
 Specifies actor-functionality relationship :
Helps to implement security mechanism
 Useful in preparing docs: Users’ manual
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10.
Thank-U…!!!
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