Coordination of the installation and of the commissioning of the machine [LHC]

The installation of the LHC machine is now finished, and the powering tests are on-going. Since the start of the civil engineering works in 1998, a lot of installation works and tests had been performed by different groups and departments, by different type and size of contracts, and with different technologies. During the last ten years, we had to face different hazards and delays, inherent to a large and complex project. This paper describes the methodology followed by the coordination team, and draw up a balance sheet of the works done so far.