@@geekific When you design a system you describe its expected behaviour from interacting persons and systems perspective with a Use Case Diagram right? But would it be logical to create a Sequence diagram to describe the details of and sequence of every single use case? So to say a Sequence Diagram is a level lower in the design phase.
Yes! I agree it is a lower design level phase, however you may find that sometimes it is an overkill to represent every single scenario with a sequence diagram, make sure you don't abuse and spend more time on it than it actually needs! Hope this helps :)
