the base use case doesn’t need any reference to the extending use case in the sequence. For this reason, it is highly unlikely that an extending use case will be suitable to extend more than one base use case.Īs to dependency, the extending use case is dependent on the base use case and is again a one-way dependency, i.e. One important aspect to consider is that the extending use case can ‘insert’ behavior in several places in the base use case’s flow, not just in a single place as an included use case does.
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