Hadron-hadron collisions at high energies are investigated in the Ultrarelativistic-Quantum-Molecular-Dynamics approach. This microscopic transport model describes the phenomenology of hadronic interactions at low and intermediate energies ( √ s < 5 GeV) in terms of interactions between known hadrons and their resonances. At higher energies, √ s > 5 GeV, the excitation of color strings and their subsequent fragmentation into hadrons dominates the multiple production of particles in the UrQMD model. The model shows a fair overall agreement with a large body of experimental h-h data over a wide range of h-h center-of-mass energies. Hadronic reaction data with higher precision would be useful to support the use of the UrQMD model for relativistic heavy ion collisions.

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