2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/5585A general review is given of Mira and other cool variable stars, concentrating on those aspects on which GAIA, and more particularly GAIA spectroscopy and radial velocities, will have a major impact.10 pages, one diagram, to appear in ``GAIA Spectroscopy, Science and Technology" ASP Conf. Ser. ed U. MunariAstrophysicstext