Classify statements into symptom, cause, hypothesis, or action during an investigation.
Sort each statement into the role it plays in the investigation. Symptom Verified cause Testable hypothesis Action Checkout errors rose from 2% to 18% between 10:00 and 10:30. Payment retries failed after the 3DS challenge returned HTTP 409. EU users may be abandoning because the 3DS message looks like a bank error. Route 20% of traffic through the backup provider and compare failure rates. Support tickets doubled among customers using corporate cards. The new retry job ran twice because the scheduler used local time after deploy. If card type is the cause, failures should cluster in corporate-card BIN ranges. Add…
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