  Amplitude and partial wave analyses for pion, eta or kaon photoproduction are
discussed in the context of `complete experiments'. It is shown that the
model-independent helicity amplitudes obtained from at least 8 polarization
observables including beam, target and recoil polarization can not be used to
determine underlying resonance parameters. However, a truncated partial wave
analysis, which theoretically requires only 5 observables will be possible with
minimal model input.
