A Use Case Diagram and a Sequence Diagram in Software Development

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Structured Systems Analysis and Design

• UML Sequence Diagrams
• UML Use case diagrams

Presented by Group 9 Master of Science in
Information Systems 29th October,
2018 Conference Room, Level 4, College of
Computing and Information Sciences, Makerere
University
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The Team
Name Reg No St No Email
Shafiq Lutaaya 2018/HD05/2094U 1800738426 lutayashafiq_at_gmail.com
Sharon Nakigudde 2018/HD05/2116U 1800739052 nakiguddesharon_at_gmail.com
Monica Alwelo 2018/HD05/2165U 1800737028 monicalwelo_at_gmail.com
Henry Paul Mbaguta 2018/HD05/2097U 1800738553 phmbaguta20_at_gmail.com
Esther Nanyonga enanyonga_at_gmail.com
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Objectives

• 1. Sequence diagram overview
• 2. Use case diagram overview

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UML Sequence diagram
A sequence diagrams is a type of interaction
diagram that describes interactions among classes
in terms of exchange of messages. It is an
interaction diagram because it describes how and
in what order a group of objects work together.
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Symbols used in a sequence diagram
Object Symbol
Asynchronous message return symbol
Activation box
Asynchronous create message symbol
Delete Message Symbol
Actor
Synchronous message symbol
Asynchronous message symbol
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Example UML Sequence diagram
The sequence diagram below illustrates a
client-server communication
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Use case Diagram

• Definitions
• A Use Case Diagram is a dynamic or behavior
  diagram in Unified Messaging Language used in the
  requirements elicitation phase.
• A use case (class) is a specification of actions,
  including variants, which a system (or
  otherentity) can perform, interacting with an
  actor of the system. A use case is a specific way
  ofusing the system by performing some part of
  the functionality
• Function
• Use Case diagrams model the functionality of a
  system using actors and use cases.

Use case diagram
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Symbols used in Use case diagrams
Actor
Extended relationships
Use case
System boundary
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An example of a Use case Diagram
Use case diagram
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Thank you