Introduction

This file file serves as your book's preface, a great place to describe your book's content and ideas.

Basic Sequence Diagram Notations

Class Roles or Participants Class roles describe the way an object will behave in context. UML object symbol is used to illustrate class roles, but doesn't list object attributes.

Activation or Execution Occurrence Activation boxes represent the time an object needs to complete a task.

Lifelines Lifelines are vertical dashed lines that indicate the object's presence over time.