Question 2: Draw 1 ) a context data flow diagram ( level - 0 ) and 2 ) a level - 1 diagram for cash withdrawal process for ATM at First Memphis Bank :" When a customer wishes to withdraw cash at ATM at First Memphis Bank , he or she must insert a debit cart and enter password . The ATM verities card information and password based on customer information saved in a customer file , and displays menu options in which customer can enter the amount of cash he or she wishes to withdraw . Once the customer enters the amount , the ATM checks the fund available in the customer's account based on data stored in an account file . The ATM dispatches the cash , and prints a receipt also using and updating the data stored in the account file