The term 'happy day' is often used in the context of which of the following investigation techniques?
Which of the following investigation techniques is MOST appropriate for collecting quantitative information?
A business analyst has identified that one of the use cases on a use case diagram contains a large amount of optional processing. This optional processing is so large that he has decided to remove it to a separate use case which can be called by the original use case if required. How should the original use case be linked to the new use case?