  The KLOE-2 experiment is undergoing commissioning at the DA$\Phi$NE
$e^{+}e^{-}$ collider of the Frascati National Laboratory of the INFN, after
the integration of new detectors in the former KLOE apparatus. The Inner
Tracker, a very light detector (material budget $<2\%X_{0}$), is one of the new
subdetectors and it is composed of 4 cylindrical triple-GEM with a stereo X-V
strips/pads readout. The commissioning phase of the Inner Tracker consists in
the characterization of the detector response and in its performance
evaluation. The method used to evaluate its detection efficiency is reported,
together with some preliminary results.
