The Same Item Everywhere Incident
Apply failure-mode thinking to diagnose repeated-item and low-diversity recommender incidents.
Repeated slate Four slots in a ten-item slate point to near-duplicates. CTR is stable, but skips and complaints are rising. A model can be locally accurate and still produce a bad slate. FMEA for recommenders Function -> Failure mode -> Effect -> Control Name the recommender function that failed before choosing the fix. Repetition can originate before ranking, during scoring, or after final slate composition. Reflex Add a penalty somewhere The fix targets the failed function, not the symptom label. A slate-quality incident needs a failure mode, not just a lower score. 01 Effect 02 Layer 03 Supplier case Decision…
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