Various components in sequence diagrams

Question

Write down the various components in the sequence diagrams.

Answer 1

i) Actor: Actor represents the external user / end user who interact with system.

ii) Object: Object is represented by one of components of system.

iii) Unit: A unit is the subsystem, or the sub component or other entity in system.

iv) Separator: Separator represents the boundary among sub systems, components or units.

v) Group: Represents different header elements in subsystem.