2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81942We discuss the problems involved in extracting the nuclear equation-of-state from heavy-ion collisions. We demonstrate that the equation of state becomes effectively softer in non-equilibrium and this effect is observable in terms of collective flow effects. Thus, non-equilibrium effects must be included in transport descriptions on the level of the effective mean fields. A comparison with transverse momentum, rapidity, and centrality selected flow data show the reliability and limitations of the underlying interaction which was derived from microscopic Dirac-Brueckner (DB) results.11 pages, 6 figures, to be published in the proceedings of the 3rd International Balkan School on Nuclear Physics, Thessaloniki, Greece, 18-24.09.2002Nuclear Theorytext