• Before: There was no evidence Iraq had ever abandoned its nuclear program. Saddam was trying to get fissile material to produce a bomb. He also made repeated attempts to acquire high-specification aluminum tubes that could be used as centrifuges. Iraq was unlikely to build a nuclear weapon until the end of the decade, but it could produce one within a year if it acquired weapons-grade fissile material abroad.

• After: Iraqi scientists and senior government officials have made clear that Saddam still wanted to acquire nuclear weapons. It's not surprising that no evidence had been found of uranium enrichment facilities because no agency thought such a facility had been built. It is unclear whether the aluminum tubes were intended for nuclear or conventional weapons.

Tenet: "My provisional bottom line today: Saddam did not have a nuclear weapon, he still wanted one, and Iraq intended to reconstitute a nuclear program at some point. We have not yet found clear evidence that the dual-use items Iraq sought were for nuclear reconstitution. We do not yet know if any reconstitution efforts had begun. But we may have overestimated the progress Saddam was making."

Missiles:

• Before: Iraq had a ballistic missile capability that exceed the 150-kilometer limit set by the United Nations.

• After: Iraq had advanced design work for a liquid propellant missile with a range of 1,000 kilometers. Inspectors have also confirmed that Iraq was working on prohibited solid-propellant missiles and that Iraq was secretly negotiating with North Korea to obtain missile technology.

Tenet: "My provisional bottom line on missiles: We were generally on target."

Unmanned Aerial Vehicles:

• Before: Iraq has ben trying to modify the MiG-21 and the L-29 jet trainer aircraft into unmanned aerial vehicles (UAVs) that could be used for chemical or biological weapons. Iraq said in its Dec. 7 declaration that its UAVs have a range of only 80 kilometers. But one was detected that went 500 kilometers.

• After: Although Iraq revealed some details of its UAV program in a declaration to the United Nations in 2002, important design elements were never revealed. A senior Iraqi official has now admitted that the UAVs were intended for the delivery of biological weapons.

Tenet: "My provisional bottom line today: We detected the development of prohibited and undeclared unmanned aerial vehicles. But the jury is still out on whether Iraq intended to use its newer, smaller unmanned aerial vehicle to deliver biological weapons."