The satellite COROT, launched in Dec 2006 and dedicated to
stellar seismology and the search for extra-solar planets, is
allowing continuous and very accurate photometric tracking
of a selected sample of stellar targets in search for magnitude
microvariability on different timescales.
As the targets for space observations have been especially chosen
among the different main-sequence pulsating stars, CoRoT will offer an
extraordinary opportunity to improve our understanding of stellar
evolution by directly probing stellar interiors through the study of
radial and non-radial oscillations. To achieve the science goals,
however, we crucially need to match space data with simultaneous
ground-based spectroscopic characterization of the targets. In this
talk  we will especially report on this part of the project and its
combined impact on the forthcoming results of the mission.