TTP01-29 Steps towards the QCD calculation for e+ e- --> 3 jets at NNLO

3 jets at NNLO > High precision analyses of experimental data for e+ e- annihillation, such as determination of jet rates or event shape observables, call for complete

      next-to-next-to-leading order (NNLO) perturbative QCD predictions. In this talk, we discuss the various ingredients entering the calculation of the NNLO corrections
      in e+ e- annihillation.