∟What Is a Sequence Diagram?

This section describes the UML Sequence Diagram, which presents interaction behaviors of multiple objects by showing communication message interchange sequences between them.

What Is a Sequence Diagram? A Sequence Diagram is a diagram that describes interaction behaviors of multiple objects by showing communication message interchange sequences between them.

In the OMG UML 2.4.1 specification, Sequence Diagram is referred as: Sequence Diagram focuses on the Message interchange between a number of Lifelines.

The picture below shows you a good example of a Sequence Diagram describing interaction behaviors between an email client computer and a server computer with sequenced messages:

UML Diagram Example - Sequence Diagram
UML Diagram Example - Sequence Diagram

Table of Contents

 About This UML Tutorial Book

 Introduction of UML (Unified Model Language)

 UML Class Diagram and Notations

 UML Activity Diagram and Notations

►UML Sequence Diagram and Notations

►What Is a Sequence Diagram?

 Sequence Diagram - Lifeline Notation

 Sequence Diagram - Message Notation

 Sequence Diagram - Execution Specification Notation

 Sequence Diagram - Frame Notation

 UML State Machine Diagram and Notations

 UML Use Case Diagram and Notations

 LibreOffice Drawing Extension - UML Elements

 MS Visio 2010 - UML Drawing Tool

 References

 Full Version in PDF/EPUB