  Using the data collected by the four experiments at LEP during 1990-1994, a
precise measurement of the tau longitudinal polarisation (P_tau) has been
performed, as well as the measurement of the transverse-transverse and
transverse-normal tau spin correlations. From the P_tau measurement, assuming
lepton universality of the neutral currents, the effective weak mixing angle
has been determined to be sin(theta_W) = 0.2325 +- 0.0006. The Standard Model
predictions are consistent with the measured results.
