Local stars as tracers of galactic evolution

We describe the overall properties of a new catalogue of metallicities, age s, and galactic orbits for a large, complete sample of F and G dwarfs in th e solar neighbourhood. Based on a magnitude-limited sample of similar to 14 000 stars, it is volume-complete to similar to 40 pc. Together with the as trophysical parameters of direct relevance to models of the evolution of th e disk, it will contain the basic photometric, astrometric, and radial velo city data from which they are derived. Information on duplicity is also inc luded. The full exploitation of the data will require a lengthy analysis, i n particular to assess the degree of completeness of subsamples of stars of different population types. An early result on the effects of diffusion of galactic orbits in the disk - essential for understanding the scatter in t he age-metallicity diagram and estimating the birth radius of stars - is br iefly illustrated.