Learn in the textbookClassifying Threats — Human Wrongdoing and Accidents
DefinitionOperational error (誤操作) is when a person with no ill intent makes a mistake in operation, causing information to leak or data to be lost.
ExplanationInformation security threats can be divided, for example, into human, physical and technical ones, and operational error is a human threat caused by people. It takes forms such as sending an email to the wrong recipient or deleting needed data, and it is guarded against by checking before sending, double-checking and backups.
AnalogyIt is like delivering a hastily written letter to a different house with a similar name.