use-case

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 5 years ago . With all the hype it seems really hard to find reliable information on when to use this. So I pose the following questions, and I\'m sorry if these are really dumb questions in advance: Should I use NoSQL for user data? E.g. profiles, usernames + passwords, etc. Should I use

问题 What is the difference between include and extend in a use case diagram? 回答1: Extend is used when a use case adds steps to another first-class use case. For example, imagine "Withdraw Cash" is a use case of an Automated Teller Machine (ATM). "Assess Fee" would extend Withdraw Cash and describe the conditional "extension point" that is instantiated when the ATM user doesn't bank at the ATM's owning institution. Notice that the basic "Withdraw Cash" use case stands on its own, without the