Sagittarius , the nearest external galaxy , will be amenable to detailed abundance studies with VLT and other 8m class telescopes .
Such data , in conjuction with the similar data of our own galaxy , will allow a deeper understanding of chemical evolution .
Our study conducted with NTT shows the presence of metal-rich stars with radial velocities compatible with Sagittarius membership and of stars as metal-poor as [ Fe / H ] = -1.5 .
In this talk I shall address the way in which VLT instruments will allow to clarify this intricate situation .