Description
Recent developments in QCD phenomenology have spurred on several improved approaches to Monte Carlo event generation, relative to the post-LEP state of the art. In this seminar, the emphasis is placed, first, on recent developments in the PYTHIA event generator, including a new hybrid between the parton and dipole shower models, closely intertwined with a new model for the underlying event in hadron collisions. For aspects such as hard jet production and fragmentation uncertainties, these new models have already led to interesting results. For hard jet production in particular, comparisons with the new SUSY-MadGraph matrix-element generator will be presented, for top and SUSY production at the Tevatron and LHC, illustrating general features of QCD radiation when produced in association with heavy particles.