2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47665In this talk I discuss the motivations for supersymmetry, focussing on models with broken R-parity and lepton number. After describing the main theoretical features of these models, I discuss some of the signals expected at colliders such as Tevatron, LEP II, NLC and LHC.latex file, 14 pages, 11 figures, sprocl.sty included, talk given at the International Workshop on Quantum Effects in the MSSM, Barcelona, Sep. 1997High Energy Physics - Phenomenologytext