The last few years saw the development of a plethora of experiments and surveys probing the cosmological parameters. The Cosmic Microwave Background (CMB), the Supernovae (SN) searches and galaxy cluster data, namely via X-rays and Sunyaev-Zel'dovich effect, are among the most prolific giving detailed information about the geometry, age and structure formation of the Universe.

The program of the WS-HCP workshop was aimed at highlighting the scientific achievements and to discuss the new environment of "precision cosmology" within these three probes. The objective was to analyse...