2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190497We review some recent studies about the parameter determination of top quarks, W bosons, Higgs bosons, supersymmetric particles and in the ADD model of extra dimensions at a linear collider.16 pages, LaTeX, 9 eps figures, invited plenary talk presented by A. Bartl at the "Workshop on High Energy Physics Phenomenology (WHEPP-8)", Indian Institute of Technology, Mumbai, January 5 - 16, 2004High Energy Physics - Phenomenologytext