Role of beam polarization in the determination of WW gamma and WWZ couplings from e(+)e(-)->W+W-

We evaluate the constraints on anomalous trilinear gauge-boson couplings that can be obtained from the study of electron-positron annihilation into W pairs at a facility with either the electron beam longitudinally polarized or both electron and positron beams transversely polarized. The energy ranges considered in the analysis are the ones relevant to the Next Linear Collider and to CERN LEP 200. We discuss the possibilities of a model-independent analysis of the general CP-conserving anomalous effective Lagrangian, as well as its restriction to some specific models with reduced number of independent couplings. The combination of observables with initial and final state polarizations allows us to separately constrain the different couplings and to improve the corresponding numerical bounds.