By using the consepts of input, processing, output, and feedback to describe its function and value?

Question

Can you explain to me the description of an information system that you such as an ATM Machine?

Answer 1

you slide the card, the atm talkes to the server about your balance, you debit (or sometimes credit) your account, the atm tells the server what just happened, everything is saved and encrypted, and you walk away with your money.

atm input - ethernet or whatever to talk to money server (balance); processing - not much going on, just encryptions; output - same as input (change in balance?).

function, to talk to a server and release cash inside of it depending on request and balances.

value? indespensable if you are out of pocket change, worthless if you stole it off of the street... :P