A number of secondary indicators are also taken into account, including activity by militias, problems with ineffective police, the ability of Iraqi officials to govern effectively, the number of civilians who have been forced to move by sectarian violence, the willingness of Iraqi security forces to follow orders, and the degree to which the Iraqi Kurds are pressing for independence from the central government.

Image A slide titled Iraq: Indications and Warnings of Civil Conflict lists factors that are destabilizing Iraq. Credit... United States Central Command

These factors are evaluated to create the index of civil strife, which has registered a steady worsening for months. “Ever since the February attack on the Shiite mosque in Samarra, it has been closer to the chaos side than the peace side,” said a Central Command official who asked not to be identified because he was talking about classified information.

In the Oct. 18 brief, the index moved still another notch toward “chaos.” That briefing was prepared three days before General Abizaid met in Washington with President Bush, Defense Secretary Donald H. Rumsfeld and Gen. Peter Pace, the chairman of the Joint Chiefs of Staff, to take stock of the situation in Iraq.

A spokesman for the Central Command declined to comment on the index or other information in the slide. “We don’t comment on secret material,” the spokesman said.

One significant factor in the military’s decision to move the scale toward “chaos” was the expanding activity by militias.

Another reason was the limitations of Iraqi government security forces, which despite years of training and equipping by the United States, are either ineffective or, in some cases, infiltrated by the very militias they are supposed to be combating. The slide notes that “ineffectual” Iraqi police forces have been a significant problem, and cites as a concern sectarian conflicts between Iraqi security forces.

Other significant factors are in the political realm. The slide notes that Iraq’s political and religious leaders have lost some of their moderating influence over their constituents or adherents.