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One of the most interesting channels to search for SUSY is the directpair-production of the $\tau$-lepton superpartner, $\widetilde{\tau}$. The$\widetilde{\tau}$ is with high probability the lightest of the scalar leptons,so one of the first SUSY particles that can be observerd, and the signature of$\widetilde{\tau}$ pair production signal events is one of the most difficultones, yielding to the ``worst'' and so most global scenario for the searches.Analysis performed at LEP set the current model-independent $\widetilde{\tau}$limits, suffering from the low energy of this facility. Only under strong modelassumptions, these limits are extended to higher masses by LHC studies. In thiscontribution we show the capability of the ILC, a future electron-positroncollider with energy up to 1 TeV, for determining $\widetilde{\tau}$exclusion/discovery limits in a model-independent way, including an overview ofthe current state-of-the-art. The determination of the ``worst'' scenario for$\widetilde{\tau}$ exclusion/discovery, taking into account the effect of the$\widetilde{\tau}$ mixing on $\widetilde{\tau}$ production cross-section andefficiency, is also presented. For selected benchmarks, the prospect formeasuring masses and polarised cross-sections will be shown. The studies weredone studying events passed through the full detector simulation andreconstruction procedures of the International Large Detector (ILD) concept atthe ILC. The simulation included all SM backgrounds, as well as the machineinduced ones.

Stau searches and measurements with the ILD concept at the International Linear Collider