Modelling hadronic interactions

Optimal exploitation of hadronic final states played a key role in successes of all recent collider experiments in HEP, and the ability to use hadronic final states will continue to be one of the decisive issues during the analysis phase of the LHC experiments. Monte Carlo techniques facilitate the use of hadronic final states, and have been developed for many years. We will give a brief overview of the physics models underlying hadronic shower simulation, discussing the three basic types of modelling used in the geant4 tool-kit; data driven, parameterisation driven, and theory driven modelling, and provide comparisons with experimental data for selected models.