The so-called Principals who participated in the meetings also approved the use of "combined" interrogation techniques -- using different techniques during interrogations, instead of using one method at a time -- on terrorist suspects who proved difficult to break, sources said.

Highly placed sources said a handful of top advisers signed off on how the CIA would interrogate top al Qaeda suspects -- whether they would be slapped, pushed, deprived of sleep or subjected to simulated drowning, called waterboarding.

The high-level discussions about these "enhanced interrogation techniques" were so detailed, these sources said, some of the interrogation sessions were almost choreographed -- down to the number of times CIA agents could use a specific tactic.

The advisers were members of the National Security Council's Principals Committee, a select group of senior officials who met frequently to advise President Bush on issues of national security policy.

At the time, the Principals Committee included Vice President Cheney, former National Security Advisor Condoleezza Rice, Defense Secretary Donald Rumsfeld and Secretary of State Colin Powell, as well as CIA Director George Tenet and Attorney General John Ashcroft.

As the national security adviser, Rice chaired the meetings, which took place in the White House Situation Room and were typically attended by most of the principals or their deputies.