calculation before? >> well, you know, they're complicated computations, and what's important in investigations is as david well knows, too, you learn and you learn about the nature of crashes and investigation by experience one at a time. i mean, after you've done, you know, 15 or 20 you remember things and you know how it's done. malaysia was approaching this new and they had -- didn't have a lot of experience by bringing in the ntsb, by bringing in the faa, people like david there, they have so much more experience and i think they were able to glean this from the data. true, they already had it, but you really have to take a hard look at things sometimes and sometimes you have to just apply the eye of experience and say, you know, this is how it usually works. let's go back to what we know and let's replot these positionings based ond what we know and how things usually go. >> mary, do you think it's a fair criticism to say if you might not have had the experience needed and the faa and the ntsb did, why didn't you bring them in sooner?