2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202884The multiscattering problem is studied in the matrix density formalism. We study how to isolate the quasi-classical degrees of freedom in order to connect with a cascade approach. The different problems that arise, as well as their possible solutions, are discussed and exemplified with a pion-nucleus model.32 pages, REVTEX, 7 figures (eps). Conection with transport models and references added. To appear in Eur.Phys.J.ANuclear Theorytext