We unpack why strong-looking plaintiff cases die by a thousand cuts and show how to detect and repair narrative decay with the Narrative Stability Index. Jurors build stories, not spreadsheets, so we track entropy, load, and drift to keep the case coherent and stable.

• burden of proof makes ambiguity fatal for plaintiffs
• echo chambers and mock trial snapshots hide decay
• jurors as storybuilders seeking internal and external fit
• cognitive load as the real danger signal, not anger
• confirmation and confidence bias in trial teams
• NSI framework: entropy, coherence load, outcome drift
• operational loop: observe, structure, debrief, decide
• repairs: simplify, anchor to rule-breaking, stabilize credibility
• culture change: data removes ego and thanks the messenger
• use NSI during discovery to shape the whole case

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