'Do you have to put extend in a sequence diagram?

I wanted to know if you have to put an extend in a sequence diagram. Let's say I have a use case diagram for registration. I have included an extend which is re enter password. Does that have to be in a sequence diagram or do I not put it in?

Thanks

umluse-casesequence-diagram


Solution 1:[1]

A SD is used to show a certain sequence of messages in a certain context. If you model a collaboration you tell in which context this collaboration happens. If your context is that where you re-enter the passwort then you show those messages happening there. If you context is the "sunny day" then you just skip that part.

There is no single SD for a system you design. There are as many SDs as you need to make clear how the system works.

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Solution Source
Solution 1 qwerty_so

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