Invite an adversarial collaborator
Find someone whose genuine prior is the opposite of yours, and work together on the same evidence.
Key takeaways
- What it is: Find someone whose genuine prior is the opposite of yours, and work together on the same evidence.
- Why it works: Adversarial collaboration — proposed by Daniel Kahneman as a method for scientific disputes — assigns a person with an opposing prior to co-investigate the same question. Unlike mere exposure to opposing arguments, this requires genuine collaborative analysis, which makes dismissal structurally harder: the adversary is in the room and will challenge any motivated reasoning immediately. The shared public commitment to the outcome also reduces motivated reasoning on both sides.
- Evidence: Established clinical or therapeutic practice.
- Avoid: Using a "devil’s advocate" who does not actually believe the opposing view — they produce weaker, less persistent challenges than a genuine believer, and both parties know it.
Why it works
Adversarial collaboration — proposed by Daniel Kahneman as a method for scientific disputes — assigns a person with an opposing prior to co-investigate the same question. Unlike mere exposure to opposing arguments, this requires genuine collaborative analysis, which makes dismissal structurally harder: the adversary is in the room and will challenge any motivated reasoning immediately. The shared public commitment to the outcome also reduces motivated reasoning on both sides.
How to do it
- 1Identify an important decision or belief where you have a strong prior.
- 2Find someone who has a genuine opposing view and a stake in being right — not just a devil’s advocate.
- 3Agree on what evidence would count and share the analysis process.
- 4Commit publicly to accepting the conclusion, even if it contradicts your prior.
What the evidence says
Clinical practiceAdversarial collaboration was used by Kahneman and colleagues to resolve scientific disputes about unconscious cognition. Its effectiveness as an individual debiasing tool is mechanistically sound but has less formal experimental testing than the laboratory bias interventions.
Honest caveat: Adversarial collaboration requires a willing, capable, and genuinely opposing partner — difficult to arrange in everyday life. Most useful for high-stakes decisions.
Common mistake
Using a "devil’s advocate" who does not actually believe the opposing view — they produce weaker, less persistent challenges than a genuine believer, and both parties know it.
IX Coach can take the position of a genuine skeptic on any plan you share, generating the kind of persistent, well-informed challenge that a real adversarial collaborator would provide.
Practice this with IX Coach →