2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219724We discuss first a method of measuring $τ$ polarisation at the ILC using the 1--prong hadronic decays of the $τ$. We then show in this contribution how a study of the $\tilde τ$ sector and particularly use of decay $τ$ polarisation can offer a very good handle for distinguishing between mSUGRA and a SUSY-GUT scenario, both of which can give rise to appropriate Dark Matter.5 pages, 4 figures. Talk given by R. Godbole at the LCWS/ILC 2007 workshop at DESY, Hamburg, Germany. Version submitted to the Proceedings plus acknowledgementsHigh Energy Physics - Phenomenologytext