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How Israeli intelligence failures led to a ‘devil’s advocate’ role

Israel’s inability to perceive enemies’ plans before 1973 Yom Kippur War led to creation of the Tenth Man, a way to ensure contrary assessments at least get a hearing.

6 min read
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Israeli troops take cover from Syrian warplanes on Oct. 8, 1973, on the Golan Heights, two days into the Yom Kippur War. One chapter of Why Dissent Matters looks at why Israel was caught off guard.


The October 1973 Yom Kippur War, known in the Arab World as the Ramadan War, showed the risks to Israel of underestimating dangers to national security, no matter how small or insignificant they may seem. It is the classic intelligence failure in Israeli history and it happened because the military establishment was captivated and captured by what they called The Concept of Arab Intentions — a preset world view that did not contemplate the possibility of an all-out assault. In an excerpt from Why Dissent Matters, William Kaplan looks at a key idea that came out of the post-war inquiry, The Tenth Man.

The Tenth Man is a devil’s advocate. If there are 10 people in a room and nine agree, the role of the tenth is to disagree and point out flaws in whatever decision the group has reached.

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