2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44807I review the use of effective lagrangians in describing the physics beyond the standard model, several theoretical and practical aspects are discussed. It is argued that the only situations where new physics can be observed corresponds to cases where the standard model cntributions are extremely suppressed and where high quality data is avaliable.(Presented at the conference "Electroweak Interactions and Unified Theories, Moriond 1993) Preprint UCRHEP-108. 11 pages. Requires phyzzxHigh Energy Physics - Phenomenologytext