  In the current region of semi-inclusive deep-inelastic scattering, most
events are accompanied by intensive radiation of soft and collinear partons
which cannot be reliably described at any fixed order of perturbative QCD. In
this paper, a resummation formalism that describes such multiple parton
radiation is compared to the HERA data on semi-inclusive DIS, including the
distributions of energy flow and charged particle multiplicity. We show that
the resummation of multiple parton radiation improves the agreement between the
theory and the data. We make some suggestions on further experimental study of
multiple parton radiation at HERA.
