2868 20160701171712.0 10.1017/S1743921310003637 DOI ASTROimport-1025 Vallenari, A. 2010 Synthetic Stellar libraries and SSP simulations in the Gaia Era The Gaia mission will obtain accurate positions, parallaxes and proper motions for 109 object all over the sky. In addition, it will collect low resolution spectroscopy in the optical range for ~109 objects, stars, galaxies, and QSOs. Parameters of those objects are expected to be part of the final Catalog. Complete and up-to-date libraries of synthetic stellar spectra are needed to train the algorithms to classify this huge amount of data. Here we focus on the use of the synthetic libraries of spectra calculated by the Gaia community to derive grids of Single Stellar Populations as building blocks of population synthesis models. Sordo, R. Tantalo, R. Allard, F. Blomme, R. Bouret, J.-C. Brott, I. Fremat, Y. Martayan, C. Damerdji, Y. Edvardsson, B. Josselin, E. Plez, B. Kochukhov, O. Kontizas, M. Schweitzer, A. Zorec, J. Tsalmantza, P. Munari, U. Saguner, T. Stellar Populations - Planning for the Next Decade 262 2010 444-445 http://esoads.eso.org/abs/2010IAUS..262..444V published in NONREF