  The era of high-precision astrometry has dawned upon us. The potential of
Gaia $\mu$as-level precision in positional measurements is about to be
unleashed in the field of extrasolar planetary systems. The Gaia data hold the
promise for much improved global characterization of planetary systems around
stars of all types, ages, and chemical composition, particularly when
synergistically combined with other indirect and direct planet detection and
characterization programs.
