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Hierarchy in an ATM System

  • Checking of the pin entered is done.
  • If the pin is wrong,user is asked to re-enter.
  • Else he can view his balance or
  • Withdraw the required amount of money.
  • Control is then passed to Auto-teller machine.
  • Hierarchy re-inforces the concept of modularity.
  • It helps in delegation of the work of designers.
  • It is easier to design a complex system.

By Charu Jain

Hierarchy in an ATM System

By Charu Jain

Example 1:

Processing

User Interface

Withdrawl

  • Money is given along with the receipt
  • Inserts the card
  • Enters the pin
  • Checking of the pin
  • Processing the request

of customer

Example 2:

Processing Sub-system

Advantages of using Hierarchy:

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