  In many SUSY models the first SUSY signal in the proposed International
Linear Collider is expected to come from the pair production of $\tilde\tau_1$,
followed by its decay into $\tau$+LSP. We study a simple and robust method of
measuring the polarization of this $\tau$ in its 1-prong hadronic decay
channel,and show how it can be used to discriminate between SUSY models and to
determine SUSY parameters.
