Involved people at OAB: Bardelli.
The standard CDM model predicts that the evolution of clusters and, in part, of galaxies could be rather rapid and start at relatively modest redshifts. For this reason it is important to perform surveys in the redshift range [0.2 - 0.7].
Concerning the clusters, a spectroscopic follow up of candidate clusters (detected in the EIS survey) started at the ESO telescopes. Using SOFI observations to define a colour-magnitude diagram for galaxies, the most probable cluster members were selected: this approach enhances the efficiency of the EFOSC2 observations (Ramella, ..., Bardelli et al. 2000, A&A in press), which give the definitive redshift of the systems.
Another way to approach the problem is to select groups of galaxies from the ESO-Sculptor survey (deLapparent, .., Bardelli et al. 1997, Messenger 89, 21), a redshift survey limited to R=20.5. The study of the morphology-density relation and of the star formation rate as a function of the environment at these intermediate redshifts will give important information on the galaxy population.