We extract nucleon resonance parameters from an effective Lagrangian m
odel employing the K-matrix approximation. To this end we analyze simu
ltaneously all available data for reactions involving the final states
pi N, pi pi N, eta N, and K Lambda in the energy range m(N) + m(pi) l
ess than or equal to root s less than or equal to 1.9 GeV. The backgro
und contributions are generated consistently from the relevant Feynman
amplitudes, which significantly reduces the number of free parameters
.The sensitivity of the parameters upon the pi N-partial-wave analysis
and the details of the Lagrangians and form factors used are discusse
d.