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The gradual shift in how AI systems are actually used compared to how they were designed or authorised to be used. Structural drift occurs without deliberate decisions as systems are applied to new contexts, edge cases become normal cases, and scope expands through precedent.
A system designed for fraud detection is used to flag 'unusual' customer behaviour. What counts as 'unusual' expands over time. The system now effectively segments customers, though it was never authorised for that purpose. Structural drift occurred through use.
Section 5.1: Delegation Boundaries