During STS-113 in November 2002, Space Shuttle Endeavour delivered the P1 (P-One) Truss to the International Space Station. The new element, which is 13.7 meters (45 feet) long and 4.6 meters (15 feet) wide, was the fourth segment of the Integrated Truss Structure, or ITS, delivered to the station.

On Nov. 26, Commander Jim Wetherbee commanded the shuttle's robot arm to remove the P1 from its berth in the payload bay. He handed it off to the station's Canadarm2, operated by Expedition Six Commander Ken Bowersox and Expedition Five NASA ISS Science Officer Peggy Whitson. They maneuvered the truss segment to its installation point at the end of the S0 (S-Zero) Truss.

During three spacewalks, Mission Specialists Michael Lopez-Alegria and John Herrington completed the installation process. They made mechanical, power and data connections between the P1 and the S0, removed launch restraints and relocated a Crew and Equipment Translation Aid, or CETA, cart to the other end of the ITS.