The two measures that we looked at were focused on the security, because the original measures had been focused on facilitation, as was noted in the Auditor General's report. By definition the equipment is more secure because it does a better job of detection. The first measure selected was the number of bags or the percentage of bags that were screened with the new technology, out of the bags at those airports that were going to the U.S.
The second measurement was the reliability of the technology, which is clearly important in demonstrating the security value.