  One year ago, we presented a new approach to treat hadronic interactions for
the initial stage of nuclear collisions. It is an effective theory based on the
Gribov-Regge formalism, where the internal structure of the Pomerons at high
energies is governed by perturbative parton evolution, therefore the name
"Parton-Based Gribov-Regge Theory". The main improvement compared to models
used so-far is the appropriate treatment of the energy sharing between the
different elementary interactions in case of multiple scattering. It is clear
that the above formalism is not yet complete. At high energies (RHIC, LHC), the
multiple elementary interactions (Pomerons) can not be purely parallel, they
interact. So we introduce multiple Pomeron vertices into the theory.
