How do I practice expert disagreement?

The most direct way to practice expert disagreement is through a focused exercise: Identify one domain where you currently follow expert advice — health, finance, parenting, productivity, career strategy. Search for a credentialed expert who recommends the opposite of what you currently do. Write down both positions side by side, then apply Goldman's five-source framework: (1) What arguments does each expert present? (2) What do other experts in the field say? (3) What do meta-experts or systematic reviews conclude? (4) What interests or biases might each expert have? (5) What is each expert's track record of prediction? Score each expert on these five dimensions. You are not trying to pick a winner. You are building a map of where the disagreement lives and what it reveals about the limits of current evidence.

Common pitfall: Two symmetrical failures. First: expert shopping — you search for the expert whose conclusion matches your existing preference, then cite their credentials as justification for doing what you were going to do anyway. The disagreement between experts becomes invisible because you never seriously engaged the dissenting view. Second: epistemic paralysis — the disagreement between experts overwhelms you, so you conclude that nobody knows anything and you might as well ignore all expert advice. Both failures destroy the information the disagreement carries. Expert shopping destroys it by pretending the disagreement does not exist. Paralysis destroys it by treating the disagreement as evidence that expertise itself is worthless rather than as a map of genuine uncertainty.

This practice connects to Phase 19 (Contradiction Resolution) — building it as a repeatable habit compounds over time.