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The VLTI Spectro Imager (VSI) was proposed as a second-generation instrumentof the Very Large Telescope Interferometer providing the ESO community withspectrally-resolved, near-infrared images at angular resolutions down to 1.1milliarcsecond and spectral resolutions up to R=12000. Targets as faint as K=13will be imaged without requiring a brighter nearby reference object. The uniquecombination of high-dynamic-range imaging at high angular resolution and highspectral resolution enables a scientific program which serves a broad usercommunity and at the same time provides the opportunity for breakthroughs inmany areas of astrophysic including: probing the initial conditions for planetformation in the AU-scale environments of young stars; imaging convective cellsand other phenomena on the surfaces of stars; mapping the chemical and physicalenvironments of evolved stars, stellar remnants, and stellar winds; anddisentangling the central regions of active galactic nuclei and supermassiveblack holes. VSI will provide these new capabilities using technologies whichhave been extensively tested in the past and VSI requires little in terms ofnew infrastructure on the VLTI. At the same time, VSI will be able to makemaximum use of new infrastructure as it becomes available; for example, bycombining 4, 6 and eventually 8 telescopes, enabling rapid imaging through themeasurement of up to 28 visibilities in every wavelength channel within a fewminutes. The current studies are focused on a 4-telescope version with anupgrade to a 6-telescope one. The instrument contains its own fringe trackerand tip-tilt control in order to reduce the constraints on the VLTIinfrastructure and maximize the scientific return.

VSI: the VLTI spectro-imager