  ALICE is the CERN LHC experiment optimised for the study of the strongly
interacting matter produced in heavy-ion collisions and devoted to the
characterisation of the quark-gluon plasma. To achieve the physics program for
LHC Run 3, a major upgrade of the experimental apparatus is ongoing. A key
element of the upgrade is the substitution of the Inner Tracking System (ITS)
with a completely new silicon-based detector whose features will allow the
reconstruction of rare physics channels, not accessible with the previous
layout. The enabling technology for such a performance boost is the adoption of
custom-designed CMOS MAPS as detecting elements. The installation of the
detector in the ALICE cavern is completed and few months of commissioning will
allow the final integration into the central systems. In this talk, an overview
of the adopted technologies as well as the status of the detector commissioning
will be given.
