Corollary Principle

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The perceptions that precluded intelligence analysts from looking for a plot in which explosives were disguised as printer cartridges was the corollary principle. The Corollary principle is it takes more information, and more unambiguous information, to recognize an unexpected phenomenon than an expected one (Heuer, 1999). In this case, American and British intelligence did not expect an attack on the air cargo system, rather one that is aimed at the air passenger system, since this was more probable because of 9/11. 2 How would those perceptions have affected intelligence analyst judgments related to the threat posed by possible further use of efforts to hide explosives in ways previously unseen? The way Al-Qaeda hid the bombs as printer
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