article_snippet: How quickly or slowly Iran will be allowed to advance Iran nuclear technology in the last five years of an agreement.
article_snippet: Iran's Araghchi agreed.
article_snippet: Many are related to proliferation and transfer of missile technology and are tied to certification by the U.N. nuclear watchdog, the International Atomic Energy Agency, that Iran's nuclear program does not have a military dimension.
article_snippet: Iran also wants to be allowed to develop more advanced centrifuges while the deal is in effect.
article_snippet: New machines would enrich uranium much faster than current machines.
article_snippet: U.S. and European officials worry that could enable Iran quickly to produce enough highly enriched uranium for a nuclear weapon.
article_snippet: Diplomats said Iran has agreed to a cap of fewer than 6,000 centrifuges that Iran can operate to enrich uranium.
article_snippet: Iran currently runs about 10,000 centrifuges, but Iran has around 19,000 in Iran stockpile.
article_snippet: U.S. officials maintain the number is not that important, because there will be other restrictions on the levels of enrichment and type of centrifuges Iran can operate, which U.S. officials believe will extend the time Iran would need to produce enough fissile material for a nuclear weapon -- known as the "breakout time"  -- to at least a year.