2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/11120In this brief contribution, I outline hopes of understanding the origin of galaxy scaling relations using numerical simulations as a tool to gain understanding. The case of the Tully--Fisher relation for disk galaxies is used as an example to illustrate the modest achievements to date and the difficult tasks ahead.5 pages, 2 epfs figures included. Contribution to the proceedings of 3rd ESO-VLT Workshop "Galaxy Scaling Relations : Origins, Evolution and Applications", Garching, 18-20 November 1996Astrophysicstext