Chemodynamics of the Milky Way and disc formation history: insight from
  the RAVE and Gaia-ESO surveys
  Multi-object spectrographs have opened a new window on the analyses of the
chemo-dynamical properties of old Milky Way stars. These analyses allow us to
trace back the internal mechanisms and the external factors that have
influenced the evolution of our Galaxy, and therefore understand fundamental
aspects of galaxy evolution in general. Here, we present recent results from
the RAdial Velocity Experiment (RAVE) and the Gaia-ESO survey. These surveys
explore the Milky Way properties in different ways, in terms of sample size and
selection, magnitude range, and spectral resolution. We focus here on (i) the
first direct detection of evidence for radial migration within the thin disc,
providing insight into the history of spiral structure of the Milky Way, and
(ii) the chemo-dynamical characterisation of the metal-weak thick and thin
discs, for which chemo-dynamical models still have difficulties in reproducing.
