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LESSON 4 · Think Like Sherlock

Safe Elimination Practices

To use eliminative reasoning without falling into its traps:

  • Always ask: "What am I not thinking of?" before treating your list as complete
  • Add an "unknown cause" category to every elimination list — it keeps the world open
  • Use elimination to narrow down, not to reach a final answer
  • Combine elimination with positive evidence — do not just rule things out; look for evidence that supports what remains
  • Treat the surviving explanation as a hypothesis, not a verdict — test it further.