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Use Case Diagram (:moneybag:contents (:two:actors (:poultry_leg:How to…

- - - - :one:functionally complete
        
        :icecream:withdraw money :check:
        fill the withdraw money form :red_cross:
      - :two:meaningful for users
        
        :icecream:login the system :check:
        input the password :red_cross:
      - :three:must be activated by actors
        
        :icecream:withdraw money :check:
        spit out the money :red_cross:
    - - :one:Process Loan
      - :two:Bank::Process Loan
      - :pushpin:verb-object structure
    - - :explode:an instance of a use case
    - - :icecream:practice
      - :cherry_blossom:details
        
        :one:process step :red_cross:
        
        :icecream:insert the card / input the password
        
        :palm_tree:unmeaningful for actors
        
        :two:
  - - - :explode:actors are on the left side, while use cases are on the right side
    - - :explode:person, thing or another system
    - - :arrow_right:相同的user可以play multiple roles,
    - - :one:Who has clear requirement and aim for the system, and act actively？
      - :two:Who is the system for?
      - :icecream:example
        
        Automatically calculate the number of visitors of the webpage, and then generate the statistical form. Lastly, send it to the manager
        => Counter!
  - - - :explode:编程中的继承,子用例继承父用例的行为和含义,并且有其他行为: is a
      - :fire:父用例的名字为斜体,表示抽象父用例
      - 很少使用的
    - - :explode:A用例包含了B用例的行为,表示依赖关系.在执行A用例时一定会执行B用例: has a
      - the included use case never stand alone:star:
      - When a use case is executed, will the included use case of it must be executed as well
      - :warning:可以表示先后顺序(比如取款include登录),也可以表示一定包含(如登录include输入密码)
      - :checkered_flag:avoid repetition
    - - :explode:基本用例执行的时候,可以执行或者不执行扩展部分is a
      - :warning:从可选用例到对应用例
      - :icecream:example
      - :fire:Base use case(Execute query) is meaningful by itself; The extension(print query result) is not meaningful by its own