  We present measurements of the tau Michel Parameters made by the CLEO
experiment. Three different analyses are performed: a spin-independent lepton
spectrum analysis and a second spin-dependent analysis using $\ell^\pm$ \vs\
$\pi^\mp\pi^0$ events, and a third spin-dependent analysis using $\pi^+$ \vs\
$\pi^-$ events. the results are used to derive limits on the general
four-fermion couplings, the mass of the charged Higgs in the MSSM, and a
right-handed $W$ in left-right models. Many of these measurements are more
precise than the PDG world averages.
