ISS016-E-011627 (20 Nov. 2007) --- Astronaut Peggy A. Whitson, Expedition 16 commander, participates in a session of extravehicular activity (EVA) as maintenance and construction continue on the International Space Station. During the 6-hour, 40-minute spacewalk Whitson and astronaut Daniel Tani (out of frame), flight engineer, began the external outfitting of the Harmony node in its new position in front of the Destiny laboratory.