I have a not completed diagram of e-commerce order
I am not sure of the include and extend relatationship
Does this diagram is correct for the attached flow
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About the relationships
An
«extend»relationshipE - - -> Bmeans that E extends the behavior of B. B has a meaning on its own independently of its extensions, whereas E adds behavior in the context of B. E may be relevant on its own but it doesn't have to. According to your diagram:RegisterextendsLogin. This would mean thatLoginis an independent use-case that provides value even without any extension. ConverselyRegisterhappens in the context of aLoginand it could make sense on its own. I'd understand that theLoginallows also toRegisternew users.An
«include»relationshipB - - -> Imeans that B behavior always includes I behavior. B needs I, but I can is independent of B. According to your diagram:AuthenticationincludesLogin. SoAuthenticationrequiresLoginCreate orderincludesAuthentication. In consequence, every time an order is created, anauthenticationis performed, which requires aLogin. Of course, this could make sense in a highly secured ordering system. But for normal business system, this would mean a lot of mandatory logins.Search productincludesView product. I'd understand that when a user performs a product search, the search results can be viewed, and one could navigate directly to the product view. But it's not clear which actor interacts with the search.About use-cases
Use-cases should have value for the user and correspond to some user goals: Placing an order is certainly a goal for some users. But is the login really a user goal? Isn't it rather some detailed steps required to fulfil other goals? While UML is agnostic about the interaction that a use-case may represent (example argument in favor of a login use-case), use-case gurus usually consider this as a bad practice (example argument against login use-cases).
Use-cases should not be misused for functional decomposition. I'd therefore advise a careful review of the search and view use-cases: are these independent? Do they both provide value to the users? Or is one just a functional detail of the other?