2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46081This report summarises the work done during the Workshop on High Energy Physics Phenomenology 4 (S.N.Bose National Centre for Basic Sciences, Calcutta, India, Jan 2-14,1996) in Working Groups IV (Unification and Model Building) and V (Astroparticle Physics and Neutrinos).Working group report, 9 pages, latex, no figuresHigh Energy Physics - Phenomenologytext