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5 Examples of the Four Eyes Principle

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The four eyes principle is a risk control technique that requires two people to be physically present in the same place when an activity occurs. The following are common examples.

Transportation Safety

Airlines or the transportation safety agencies of nations may require that at least two pilots be present in the cockpit at all times. This is to help prevent deliberate crashes and other safety risks such as health issues.

No-lone Zone

An area that can't be accessed alone such as a room with controls for nuclear weapon systems.

Information Security

Access to hardware that manages secret cryptographic keys may be controlled with a four eye policy.


Access to vaults containing cash or other liquid assets such as gold may require two people to open the door with simultaneous authorizations.


Procedures for handling of dangerous materials such as nuclear waste.
Overview: Four Eyes Principle
Requiring two people to be physically present in the same place when an activity occurs.
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