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12 cards from this deck
Program that works properly even with unexpected data or hardware
Program that ensures only authorised users can access it
Checks incoming data meets rules before allowing it through
Checks numbers fall within acceptable limits
Ensures text has the right number of characters
Stops users leaving important fields empty
Crashes and unexpected program behaviour
Can check if data follows rules, not if it's actually correct
Users don't always enter expected data; programs need to handle this gracefully
Users could withdraw negative amounts or more than their balance
Keep asking until valid input is received
Data is sensible and expected, not necessarily correct
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