ERROR = MISTAKE ||DEFECT= BUG, FAULT || FAILURE = FAILURE

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ERROR / MISTAKE:
An incorrect human action that results in incorrect functionality is called an ERROR.

DEFECT / BUG /  FAULT / INCIDENT: 
A deviation between expected behavior to actual behavior of the system identified during testing is called a defect or BUG.

FAILURE:
The deviation between expected to actual behavior identified by end user in operation is called FAILURE.

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