  The size of non-perturbative corrections to high E_T jet production in
deep-inelastic scattering is reviewed. Based on predictions from fragmentation
models, hadronization corrections for different jet definitions are compared
and the model dependence as well as the dependence on model parameters is
investigated. To test whether these hadronization corrections can be applied to
next-to-leading order (NLO) calculations, jet properties and topologies in
different parton cascade models are compared to those in NLO. The size of the
uncertainties in estimating the hadronization corrections is compared to the
uncertainties of perturbative predictions. It is shown that for the inclusive
k_\perp ordered jet clustering algorithm the hadronization corrections are
smallest and their uncertainties are of the same size as the uncertainties of
perturbative NLO predictions.
