2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49412The prospects of physics beyond the standard model in deep inelastic scattering are reviewed, emphasizing the search for contact interactions, for leptoquarks and for supersymmetry with R-parity violation. R-parity violating supersymmetry is explored as a speculative source of events with high energy muons and missing transverse momentum, but no convincing explanation for events of this type observed at H1 is found.13 pages, 7 eps-figures included. Lecture notes to appear in the proceedings of the Ringberg Workshop 'New Trends in HERA Physics 1999'High Energy Physics - Phenomenologytext