Design a DFD for a Cash Dispenser (ATM Machine) with the following functions:
“The Cash Dispenser system uses four processes:
a. Receive-Request
b. Check-Password,
c. Withdraw, and
d. Show-Balance.
Process Receive-Request takes a request for either withdrawing or showing the balance, and sends this request to either process Withdraw or Show-Balance. At the same time, it also sends an instruction to Check-Password to check whether the input card and password are correct.
Check-Password then sends a confirmation to both Show-Balance and Withdraw.
Withdraw: requests an amount from the customer, and outputs the amount of the money if it is within the range of the account balance.
To determine whether the requested amount is small enough to be withdrawn, the system needs to keep the file account that allows all the related processes to access.
Show-Balance: outputs the present balance
Draw : Use Case Diagram by identifying
actors who use the ATM
Functionality of every Actor of the ATM software.
other components which you think is required for ATM and
Functionality of these component of the ATM software.
and the convert it into the following DFD
（1）Context Diagram
（2）Level0 DFD
（3）Level1 DFD
Use Case Diagram：
Context Diagram：
Level 0 DFD：
Level 1 DFD：
2. Draw Use Case Diagram for a Blog Website
Identify the following requirements
(1) actors who use the Blog software
(2) Functionality of every Actor of the Blog software.
(3) components of Blog software and
(4) Functionality of each component of the Blog software.
