of interactions and messages that take place among actors and objects. These actors and objects
can only remain active when another object needs them and desires to communicate with them.
The structure diagrams are responsible for depicting the structure of a system. In software devel-
opment, we use them to portray the architecture of the system and how the various components
are interconnected to each other.
With the given diagram of a sequence diagram below, you will understand their usage. It
represents the course registration system.
COMMUNICATION UML DIAGRAM
Earlier these diagrams were known as collaborative diagrams ...
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