Target Iran - Air Strikes: "One major uncertainty concerning the probability of disarming preventive strike against Iran's nuclear infrastructure is the question of American and Israeli assessments of their confidence in their assessments of the completeness of their understanding of Iran's nuclear infrastructure. It will be recalled that when the US contemplated striking China's nuclear infrastructure in mid-1964, prior to China's first nuclear test, their were doubts about the completeness of US intelligence. In fact, the US was surprised when China detonated a uranium bomb, since the US had overestimated the progress of China's plutonium program, and seriously underestimated the progress of China's uranium enrichment program. Iran's partners -- North Korea and Pakistan -- present contrasting studies in clandestine facilities. It appears that US intelligence has incomplete intelligence concerning some aspects of North Korea's plutonium program [mainly relating to whether there are undetected reprocessing facilities], and almost complete ignorance of the whereabouts of the DPRK's uranium program. The missing facilities are presumably at hidden underground locations. It is generally believed that Pakistan's major nuclear material production facilities are above ground and reasonably well characterized."

(Via GlobalSecurity.org.)