Here is a boa roentgen, if you have any doubts. He drew a picture of the boa in this state. Okay, briefly, when he was a child, the Narrator read a book on jungles and was fascinated by the fact that a boa constructor swallows his prey whole and then sleeps for few months while digesting the meal. I will summarise only the part that is relevant to the current article. Have you read Antoine de Saint-Exupéry’s novel? In this article, I’m about to show you the notations of these interactions through “The Little Prince” narrator’s interactions with the world around him. In general, a Sequence diagram describes how and in what order objects in our system interact with each other, arranged in time sequence. Implementation designs of each new feature I’m working on are loaded with Sequence diagrams. The most used by me (and my favorite) UML diagram is Sequence Diagram.