Table of Contents

1. Cosmology and cluster formation; 2. Clusters of galaxies; 3. Cosmology with clusters of galaxies; 4. Cosmogony and the structure of rich clusters of galaxies; 5. The dark matter distribution in clusters; 6. The effect of the cluster environment on galaxies; 7. Evidence for gas deficiency in cluster galaxies; 8. Properties of galaxies in groups and clusters; 9. Dynamical evolution of clusters of galaxies; 10. Hot gas in clusters of galaxies; Hydrodynamic simulations of the intracluster medium; 11. Evolution of clusters in the hierarchical scenario; 12. Distant clusters as cosmological laboratories; 13. Future key optical observations of galaxy clusters; 14. Cluster research with X-ray observation.