use case - UML sequence diagram - Diagram without actors? -

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i have scene want show exception case in sequence diagram. in case, sequence diagram pretty shows interactions between objects (classes) between actor , object. so, ok have sequence diagram without actors ?

it absolutely ok.

  1. actors 1 of main elements in uc diagrams, not in sequence diagrams. sequence diagram without messages , lifelines - 1 hard imagine. these essence of sd. , actor merely can used there, if sequence interaction between border component , external object (actor).

  2. but if extremally important, needn't use every element of main set of elements of diagram. example, use case diagram contains many use cases , additional elements other diagrams can drawn without actors - better understanding.

but if merely training use uml diagrams, draw sequence diagram actor or 2 - should learn how use them, too.


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