Dec. 16, 2002 - President Bush appoints former New Jersey Gov. Thomas Kean to chair the Commission.

March 31 - April 1, 2003 - First public hearings take place. The focus is hearing from victims and people impacted by 9/11.

May 22 - May 23, 2003 - Second public hearings take place. The focus is congressional oversight and aviation security.

July 8, 2003 - The first interim report is released.

July 9, 2003 - Third public hearing takes place. The focus is "Terrorism, Al Qaeda, and the Muslim World."

Sept. 23, 2003 - The second interim report is released.

Oct. 14, 2003 - The fourth public hearing takes place. The focus is intelligence and national security policy.

Nov.19, 2003 - Fifth public hearing. The focus is emergency preparedness.

Dec. 8, 2003 - Sixth public hearing. The focus is "Security and Liberty."

Jan. 26 - 27, 2004 - The seventh public hearings take place. The focus is border and aviation security.

March 24, 2004 - Former counterterrorism chief Richard A. Clarke testifies.

March 30, 2004 - The White House says it will allow National Security Adviser Condoleezza Rice to testify publicly before the commission investigating the September 11 terrorist attacks, so long as her appearance is not considered a precedent.

April 8, 2004 - Condoleezza Rice testifies in the morning - public and under oath. Former President Bill Clinton testifies in the afternoon. Clinton's testimony is not public or under oath.

April 9, 2004 - Former Vice President Al Gore has a three-hour private meeting with the commission. A press notice describes the Gore as "candid and forthcoming."

April 13, 2004 - Former FBI Director Louis Freeh, Former Attorney General Janet Reno and current Attorney General John Ashcroft testify at tenth public hearing. Former acting FBI Director Thomas Pickard and J. Cofer Black, former head of the CIA's counterterrorism center, also testify.

April 14, 2004 - CIA Director George Tenet and FBI Direct Robert Mueller testify in separate public sessions.

April 29, 2004 - President George W. Bush and Vice President Dick Cheney meet with the 9/11 Commission from 9:30 a.m. until 12:40 p.m., in the Oval Office at the White House. The president and vice president answer questions but are not under oath. The meeting is not officially recorded. Two members of the White House counsel's staff are allowed to take notes during the session, as are the commission members.

May 19, 2004 - Former New York City Mayor Rudy Giuliani and former director of New York City's Office of Emergency Management Jerry Hauer testify before the 9/11 Commission.

May 27, 2004 - Original deadline to report on its findings.

June 16, 2004 - Commission holds its twelfth and final public hearing on its investigation into the Sept. 11 attacks.

July 22, 2004 - The commission releases its final report. The report said the original plot called for 10 hijacked planes, al-Qaida's role in the 1993 World Trade Center bombing was uncertain and there was no "credible evidence" of cooperation between Iraq and al-Qaida.

July 15, 2005 - It is announced that actors Hilary Swank and Kevin Costner will narrate the upcoming documentary film "On Native Soil: The Documentary of the 9/11 Commission Report." The film will tell some of the survivor's stories and will examine some of the commission's recommendations.

Sept. 10-11, 2006 - ABC airs a dramatization based on the 9/11 Commission Report called "The Path to 9/11." It airs over two nights with limited commercial interruption. Former Gov. Thomas Kean, chairman of the 9/11 Commission, serves as a senior consultant on the project.

July 21, 2011 - The Department of Homeland Security releases a report citing "significant progress" in fulfilling specific recommendations made by the 9/11 Commission.

Aug. 31, 2011 - The heads of the 9/11 Commission release a report warning of gaps in terrorism prevention in the U.S. The report, Tenth Anniversary Report Card: The Status of the 9/11 Commission Recommendations, highlights nine of the commission's recommendations that remain unfulfilled.

January 2012 - Despite the 9/11 Commission's directive to make most of their material available to the public by 2009, the records remained sealed at the National Archives and Records Administration (NARA).

April 12, 2012 - 9/11 Commission Co-Chairs Tom Kean and Lee Hamilton, now leaders of the Bipartisan Policy Center's re-launched Homeland Security Project, announce new members of the project.