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 SafetyAirlines 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 ZoneAn area that can't be accessed alone such as a room with controls for nuclear weapon systems.
Information SecurityAccess to hardware that manages secret cryptographic keys may be controlled with a four eye policy.
AssetsAccess to vaults containing cash or other liquid assets such as gold may require two people to open the door with simultaneous authorizations.
SafetyProcedures for handling of dangerous materials such as nuclear waste.
This is the complete list of articles we have written about risk management.
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An overview of cascading failure and resilience.
An overview of business as usual.
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The difference between risk mitigation and risk reduction.
A list of common risk controls.
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