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Is failure correlation higher in stress tests or real‑world events? Failure correlation is almost always higher and more dramatic in real-world events than in stress tests. Stress tests are based on hypothesized scenarios (e.g., "what if a cloud provider fails?"). Real-world events involve complex, unanticipated chain reactions and emergent behaviors that are difficult to model. A stress test might simulate a network partition, but a real event could combine that partition with a coincidental software bug and a market crash, creating a cascade of failures that exceeds any single model. Real-world systems have hidden dependencies and "unknown unknowns" that stress tests, by their nature, cannot fully encompass. Therefore, while stress tests are invaluable, the true, upper limit of failure correlation is only revealed during live, high-stakes production incidents.

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