The construction work was performed by STS-116 spacewalkers Bob Curbeam and Christer Fuglesang and robot arm operators Joan Higginbotham and Sunita Williams. The P5 spacer segment's attachment to the P4 sets the stage for the addition of the P6 and its set of solar arrays.

Two more spacewalks are scheduled during STS-116's stay to reconfigure and redistribute power generated by the station's newest solar arrays. The spacewalks are set for Thursday and Saturday.

Source: http://www.amsat.org/amsat/archive/sarex/48hour/msg00183.html

STS-116 Mission Specialists Robert Curbeam and Christer Fuglesang will go spacewalking today. The primary objective of the spacewalk is to install a new piece to the space station's girder-like truss. The two-ton piece will be the fifth truss segment added to the port side of the station and is called the P5 spacer.

From inside the space station Mission Specialist Joan Higginbotham will use the station's robotic arm to move the new segment with only inches of clearance into its installation position. The spacewalkers will assist by providing two extra pairs of eyes as the exacting operation is carried out.

Students from the Thunmanskolan School, Knivsta, Sweden are scheduled to take part in an ARISS contact with ESA Astronaut and STS-116 Mission Specialist Christel Fuglesang SA0AFS/KE5CGR. The contact is expected to be conducted in Swedish. This will be the Scandinavia's first ARISS school event and is planned to take place on Sunday, December 17, 2006 at 18:19 UTC. The ground station supporting this telebridge event will be VK4KHZ located in South Australia.