Tenth Man Rule
Updated 2026-08-05
INTRODUCTION
English translation pending.
CORE DEFINITION
The tenth man rule comes from Israeli intelligence practice: if nine analysts independently reach the same assessment, the tenth is assigned to take the contrary position and argue it as convincingly as possible. The proposition is that consensus is itself a risk signal, because agreement can come from shared assumptions rather than from shared evidence. The key qualifier is that the role must be formally assigned and genuinely resourced; a devil's advocate who is ignored institutionalizes nothing.
SCAFFOLDING EFFECT
Reduce cognitive load
- Consensus alarm: Treat unanimous agreement on a high-stakes call as a trigger to look for the missing counter-case. - Role assignment: Name one person to build the strongest opposing argument rather than asking for objections in general. - Decision record: Put the dissent into the written decision so it survives the meeting.
Anchor fast decisions
Groups converge because members read one another's confidence as evidence and because disagreeing carries a social cost. Once a shared framing is in place, disconfirming information is reinterpreted rather than accumulated, so the group's error grows along with its coherence. Assigning dissent as a duty removes the social penalty, which restores the search for contrary evidence that an individual judgment would have performed on its own.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- baike.sogou.comhttps://baike.sogou.com/v10005497305.htmverified
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