in iran, they're coming in voluntaryily, albeit the threat of sanctions, the question going forward, will they continue to submit to these inspections, and will the sanctions be released automatically, or will they be able to be reimposed. the role of the inspectors is going to be tough because they have to make judgments that the political parties are not going to be willing to make themselves. they'll look for an independent body, which the inspectors will be, to make judgments about whether they think the iranian s are compliant. underlying all of that, what authorities, access and arrangements will be place in details of ensuing agreement. >> one of the things that they have gone back and forth over in these last cycle months is the number of centerfuges enriching radioactive material. if they come up with a number limit, let's say 6,000 that has been talked about, how do you know there aren't another 3,000 somewhere else? >> well, we don't. there has been a fixation on the number of centerfuges, but bear in mind that's only one part of the nuclear program. they've got to have th