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We present a measurement of the tau neutrino helicity h and the Michel parameters , and b y analyzing the decays !K , !e e and ! in e + e ! Z 0 ! + . The analysis uses the 1993-1995 SLD data sample of 4316 -pair events produced with highly polarized electrons. We obtain preliminary results of h = 0:810:180:03, = 0 : 710:090:04, = 1 : 03 0:36 0:05 and = 0 : 84 0:27 0:05.doi:10.2172/826624 fatcat:bdc5ercccjarbm5sl34jboplsi