During the five years of the mission, the Gaia spectrograph, the Radial Velocity Spectrometer (RVS) will repeatedly survey the celestial sphere down to magnitude V ~ 17–18. This talk presents: (i) the system which is currently developed within the Gaia Data Processing and Analysis Consortium (DPAC) to reduce and calibrate the spectra and to derive the radial and rotational velocities, (ii) the RVS expected performances and (iii) scientific returns.

I present a report of the work in progress towards building a graphical user interface (GUI) for STECKMAP (STEllar Content and Kinematics via Maximum A Posteriori). It is the first serious attempt at making a GUI for a software for analysis of stellar content from integrated spectra of galaxies. It will allow a wider fraction of the community to use this sort of tools thanks to improved user-friendliness. As a result, better understanding of these methods and their strengths and flaws will be achieved by the community. This software also has a strong pedagogical potential. It will contribute to a higher awareness of the community concerning the challenges and the oppportunities in stellar populations modelling. The homepage of the project is http://www.astro.u-strasbg.fr/Obs/GALAXIES/stecmap_eng.html.