The Rule Of Three
summary
Claim: the rule of three helps expose root causes by forcing at least three distinct hypotheses and tests. Explanation: human working memory 4–7 concepts limits idea generation, other fields default to three options, and software teams use “three strikes” heuristics. Example: troubleshooting a Samsung smartwatch uses three concrete steps — magnetic USB charger with iPhone adapter (no display), magnetic charger on MacBook via USB‑C adapter (watch makes sound after 1 hour), pair with phone app (battery shows full) — Samsung service confirms a software/display issue.
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