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Judgment & ambiguity · Decisions under uncertainty

Instrumentation on a deep excavation shows wall deflection trending upward but still within the design alarm limit, and the readings are noisy day to day. The excavation is only halfway down. What do you do with a trend that hasn't crossed a line yet?

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A trend that hasn't crossed the alarm is still information, and on a deep excavation I treat direction as seriously as magnitude — by the time deflection breaches the limit at half…

The full answer: structure, worked example, likely follow-up.

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