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It is shown that most of the models for analyzing meson-baryon reactions inthe nucleon resonance region can be derived from a Hamiltonian formulation ofthe problem. An extension of the coupled-channel approach to include $\pi\pi N$channel is briefly described and some preliminary results for the $N^*(1535)$excitation are presented.Comment: Latex 13 pages; to appear in the Proceedings of Workshop on the  Physics of excited nucleons (NSTAR2004), Grenoble (France), March 24-27, 200

Models of Meson-Baryon Reactions in the Nucleon Resonance Region