sequence diagrams are used most often, primarily because they enable you to see how objects use each other. Based on this information, you can more accurately determine why two objects are related.

So, I can demonstrate how class and sequence diagrams complement each other by looking at an example of the UML that simulates the standard Java event-handling mechanism. When developing Java ...

and the Sequence Diagram (SD) -- and how they relate to each other. The Logical Class Diagram Why do we need another class diagram? After all, Visual Studio already includes a class diagram which does ...