2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44996Linear collider designs are optimized for \ep\ collisions. However, from the physics point of view, \lc s may also be advantageously operated in an \ee, \eg\ or \pp\ mode. These options, which have not been available up to now, will provide unique tests of the \sm\ and of physics beyond it. As an example, we review the prospects for discovering and studying \susy\ at linear colliders in \ee, \eg\ and \pp\ collisions. In particular, we argue that \ee\ scattering is much better suited than \ep\ annihilation for discovering \sel s or \co s.11 pages of text, contribution to the Proceedings of the Workshop on Physics with $e^+e^-$ Linear Colliders, Annecy, February 15-16, 1993, the figures and the .ps file can be obtained via anonymous ftp from 129.187.198.1 in preprints/mpi9370.ps , MPI-Ph/93-70High Energy Physics - Phenomenologytext