🧠 How to Build a Red-X Clue List

1. Write Down Clues: Use observations, interviews, or data. Clues are things that help you differentiate good vs. bad outcomes.
2. Specify “Explains”: Each clue should help explain a known symptom or variation pattern.
3. Use Contrasts: Use contrasts like “Only in Station 3” or “Fails only on rainy days.”
4. Review for Contradictions: If clues contradict, investigate whether one is more reliable.

Clues feed into the Solution Tree and drive hypothesis testing (like B vs. C).