Use Case Diagram: Exercise 5 and 6

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Use Case DiagramExercise 5 and 6

• Yong Choi
• BPA
• CSUB

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• Decomposition of the system
• How many subsystems?
• Define participating actors (but no roles..)
• Benchmark chapter 7 SoundStage use case diagram

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Tips

• Apply common sense and think in terms of systems
  perspective.
• Physical processes is nothing to do with systems
  processes. In other words, most of physical
  processes do not need to be descried.
• delivery of a can of soda or money by the system

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Description Vending Machine

• This use case documents the event of a customer
  purchasing a can of soda from a vending machine.
  The soda machine has a coin slot and also a
  dollar bill receptacle. The machine accepts
  nickels, dimes, and quarters, at one coin at a
  time. The machine only accepts one-dollar bills,
  placed face up, with the top of the bill on the
  left. The machine has a coin return lever that
  can be depressed to cancel the purchase and the
  money returned via the coin return receptacle.
  The machine also has a product receptacle in
  which cans of soda are dispensed to the user. And
  finally the machine has a digital display that is
  used to display messages related to product
  prices, amount of money deposited, product out of
  stock, using exact change, out of service, plus
  user-friendly messages such as Thank You, etc.

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Precondition Vending Machine

• Machine has been stocked with product and
  currency for change.

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Trigger Vending Machine

• This use case is initiated when the customer
  deposits currency (or prepaid card) into the
  vending machine.

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Description ATM

• This use case documents the event of a customer
  withdrawing money from an ATM machine. The ATM
  has a bank card reader, a numeric keypad, a
  display screen, a money dispenser, and a receipt
  printer plus user-friendly messages such as
  Thank You, etc.

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Precondition ATM

• Machine has been stocked with money. The customer
  has a bank card

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Trigger ATM

• This use case is initiated when the customer
  inserts the bank card into the ATM.