가이드 입니다.
https://www.lucidchart.com/pages/uml-sequence-diagram
UML Sequence Diagram Tutorial
Comprehensive guide on everything you need to know about sequence diagrams in UML. We'll show you how to understand, plan, and create a professional sequence diagram with this guide!
www.lucidchart.com
그리고,
영상
https://www.youtube.com/watch?v=pCK6prSq8aw