olemus
UML: skeem, mis kujutab objektide koostööd ajas ja objektide interaktsiooni mingis stsenaariumis
= a UML diagram representing the cooperation of objects in time and the interaction of objects in a scenario

näiteid
https://duckduckgo.com/?t=h_&q=sequence+diagram&iax=images&ia=images

ülevaateid
https://en.wikipedia.org/wiki/Sequence_diagram

https://www.lucidchart.com/pages/uml-sequence-diagram

https://www.visual-paradigm.com/guide/uml-unified-modeling-language/what-is-sequence-diagram/

http://www.uml-diagrams.org/examples/sequence-example-dwr-ajax-comments.png