Tenth Man Rule
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
The tenth man rule is a decision-making convention requiring that whenever a group reaches unanimous agreement, one member is assigned to argue the opposing case whether or not that member believes it. The core proposition is that consensus is least reliable exactly when it is most complete, because shared assumptions go unchallenged. The key qualification is that the role is structural rather than personal: the appointed dissenter is performing a duty, so disagreement carries no social penalty and the group must genuinely weigh the counter-case before deciding.
SCAFFOLDING EFFECT
Reduce cognitive load
- Assign a dissenter: name one person to argue against the group's conclusion before it is locked in. - Falsification test: ask what evidence would prove the consensus wrong and whether anyone has looked. - Pre-mortem drill: run a scenario in which the decision fails and trace the reasons backward.
Anchor fast decisions
Unanimity suppresses the doubts individuals already hold, because speaking up costs status while staying silent costs nothing. Making dissent a formal assignment shifts that calculation, so the objection is expected and therefore raised. The group then has to engage with the strongest counter-argument, which surfaces assumptions and failure modes that agreement had hidden.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Devil%27s_advocateverified
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