"This National Intelligence Estimate (NIE) assesses the status of Iran's nuclear program, and the program's outlook over the next 10 years. This time frame is more appropriate for estimating capabilities than intentions and foreign reactions, which are more difficult to estimate over a decade. In presenting the Intelligence Community's assessment of Iranian nuclear intentions and capabilities, the NIE thoroughly reviews all available information on these questions, examines the range of reasonable scenarios consistent with this information, and describes the key factors we judge would drive or impede nuclear progress in Iran. This NIE is an extensive reexamination of the issues in the May 2005 assessment. This Estimate does assume that the strategic goals and basic structure of Iran's senior leadership and government will remain similar to those that have endured since the death of Ayatollah Khomeini in 1989. We acknowledge the potential for these to change during the time frame of the Estimate, but are unable to confidently predict such changes or their implications. This Estimate does not assess how Iran may conduct future negotiations with the West on the nuclear issue."