2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/70419This expository article outlines the construction of De Concini-Procesi arrangement models and describes recent progress in understanding their significance from the algebraic, geometric, and combinatorial point of view. Throughout the exposition, a strong emphasis is given to combinatorial and discrete geometric data that lies at the core of the construction.30 pages, 13 figures; final revision with only minor changes; to appear in MSRI Publications, Cambridge University PressCombinatoricsAlgebraic Geometry32S45, 57N80text