Australian Bureau of Statistics 2016 Census online outage ('CensusFail')
Australia's first mostly-online national census went offline for census night itself, embarrassing the government and undermining public confidence in the count.
The damage was public. The root cause was preventable.
Australia's first mostly-online national census went offline for census night itself, embarrassing the government and undermining public confidence in the count.
What the software actually got wrong
An independent review found the online census system's design overreacted to a small, unsuccessful denial-of-service attempt: a geo-blocking router failed to fail over correctly, and rather than degrade gracefully the system was taken fully offline out of an overly cautious abundance of caution, a decision compounded by inadequate load testing beforehand.
An independent review found the online census system's design...
An independent review found the online census system's design overreacted to a small, unsuccessful denial-of-service attempt: a geo-blocking router failed to fail over correctly
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.
Rather than degrade gracefully the system was taken fully...
rather than degrade gracefully the system was taken fully offline out of an overly cautious abundance of caution, a decision compounded by inadequate load testing beforehand
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.
Schedule a demonstration, or explore how Requs AI Edge Case and Software FMEA use the Common Defect Enumeration.