This workshop aims at bringing together astronomers working on cosmology at high redshift z > 1. Forthcoming instruments will survey large volumes of universe, uncovering the build up of the primordial cosmic web, with different observables. In particular, estimators such as gravitational lensing and galaxy clustering in redshift space can be combined to simultaneously characterise the mass and the dynamics of galaxy, groups and clusters. Comparison with simulations will then help us understand thephysical processes at play in these objects in a matter dominated universe.

In this context, it is timely to join efforts together, and share our expertise, in particular make observers meet theoreticians.

This workshop is supported by an International Cooperation Project between CNRS and CSIC.