This volume covers the collective behaviour of the Standard Model at finite temperature and density. The main physics motivation for this research comes from the early history of the Universe and also from the experimental efforts to create the quark-gluon plasma in laboratory experiments. Advances in theoretical investigations (effective theories, progress in numerical simulations, etc.) as well as the phenomenological applications figure in the broad spectrum of invited lectures. Prospective studies of beyond-the-Standard-Model theories receive particular attention. Non-equilibrium phenomena, especially questions related to baryon generation due to the electroweak anomaly and inflationary dynamics, are also discussed.