Defensive design  - helps to ensure programs function properly., Defensive design involves - anticipating how users might misuse their program, ensure code is well maintained and reduce number of errors in the code when testing., Input validation is - checking if data meets certain criteria., Range check - Checks data is within a specified range (min and max)., Presence check - Checks data has actually been entered., Format check - Checks the data is in correct format (e.g. dd/mm/yyyy)., Length check - Check data meets the correct length (e.g. at least 8 characters for a new password)., Authentication - Allowing authorised users into a system confirming their identity., Verification - Ensuring the data is entered correctly., An example of.......... - Input Validation, An example of......... - Authentication,

DEFENSIVE DESIGN

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