2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46548Together with some positive features, such as the constrained hypercharge assignments, grandunification models typically have some unwelcome aspects, mostly associated with the rich and peculiarly selected matter content. I discuss some ideas which might help to interpret (part of) this apparent complexity arising in grandunification in terms of simple structures. I also point out that the conventional criteria used to establish fine tuning in grandunified models should be modified if these models are viewed as effective low-energy descriptions of a more fundamental theory.15 pages, LaTex. Presented as plenary talk at QUARKS96, Yaroslavl, Russia, May 5-11, 1996. To be published in the proceedingsHigh Energy Physics - Phenomenologytext