  The HERWIG 5.9 cluster hadronization model is briefly discussed here. It is
shown that the model has peculiar behaviour when new heavy baryon resonances
are included in the HERWIG 5.9 particle table. New fragmentation model is
proposed to cure this problem and simple tuning of HERWIG 5.9 with this new
model has been made using event shapes variables and identified particle
momentum spectra in electron-positron interactions at LEPI. Finally, the
predictions of the two hadronization models are compared.
