The Pentagon has been working on a classified study that identifies several new experiments that could be carried out under a broad view of the treaty.

A committee that he headed did a classified study this summer at the request of the C.I.A.

Brown & Root came up with myriad ideas in a classified study and was handed a lucrative contract to implement its own plan.

"Most of the leadership strikes were offset from where Saddam stayed during the war, denying use of government buildings, but not threatening his life," the classified study says.

In the mid-1960s the US Air Force conducted a series of classified studies on next-generation space transportation systems.

A classified study prepared last summer for Mr. Gates also proposed eliminating one of the electronic eavesdropping satellites now in orbit.

According to a Washington Post report on the classified study, the experts concluded that the rush to deployment only compounded long-running technical problems.

In 2002, a joint Congressional committee was reported to have concluded the opposite in a classified study that was then the most extensive on the issue.

The best evidence is in a classified study.

The classified study contains a copy of the sketch supplied by the Germans.