Soviet early-warning system false alarm (Petrov incident)
The Oko satellite system reported five incoming US nuclear missiles; officer Stanislav Petrov's decision to treat it as a false alarm averted a likely Soviet nuclear retaliation and possible global nuclear war.
The damage was public. The root cause was preventable.
The Oko satellite system reported five incoming US nuclear missiles; officer Stanislav Petrov's decision to treat it as a false alarm averted a likely Soviet nuclear retaliation and possible global nuclear war.
What the software actually got wrong
The satellites' detection software mistook sunlight reflecting off high-altitude clouds for missile engine plumes, and the program meant to filter out exactly this kind of false signal failed to do so.
The satellites' detection software mistook sunlight reflecting off high-altitude...
The satellites' detection software mistook sunlight reflecting off high-altitude clouds for missile engine plumes
Requs AI Edge Case flags this exact pattern at the requirements and architecture stage — before a single line of code implementing it exists — so the assumption behind it gets challenged while it is still cheap to fix.
The program meant to filter out exactly this kind...
the program meant to filter out exactly this kind of false signal failed to do so
Requs AI Software FMEA traces this failure mode back to the system-level hazard it feeds, tagging it against the Common Defect Enumeration so it surfaces in review instead of in the field.
Beyond code coverage and "shall" testing
Root causes like this one rarely show up in code coverage or requirements-compliance testing, because nobody wrote a requirement anticipating the specific edge case that broke. Requs AI Edge Case and Requs AI Software FMEA are built to surface exactly this class of overlooked failure mode — before the software is written.
Surfaces this before code exists
Identifies edge cases like this one at requirements and architecture time, using the Common Defect Enumeration to catalog failure patterns seen across hundreds of real-world software failures — including this one.
Connects the failure mode to the hazard
Traces this class of root cause directly to the system-level hazard it can produce, so a defect pattern like this one gets flagged during design review instead of after it ships.
Find the overlooked root causes before they ship.
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