  One of the remaining problems within the standard model is to gain a good
understanding of the low energy regime of QCD, where perturbative methods fail.
One key towards a better understanding is baryon spectroscopy. Unfortunately,
in the past most baryon spectroscopy data have been obtained only using $\pi$ N
scattering. To gain access to resonances with small $\pi$ N partial width,
photoproduction experiments, investigating various final states, provide
essential information. In order to extract the contributing resonances, partial
wave analyses need to be performed. Here, the complete experiment is required
to unambiguously determine the contributing amplitudes. This involves the
measurement of carefully chosen single and double polarization observables.
  The Crystal Barrel/TAPS experiment with a longitudinally or transversely
polarized target and an energy tagged, linearly or circularly polarized photon
beam allows the measurement of a large set of polarization observables. Due to
its good energy resolution, high detection efficiency for photons, and the
nearly complete solid angle coverage, it is ideally suited for the measurement
of the photoproduction of neutral mesons decaying into photons.
  Preliminary results for the target asymmetry T, recoil polarization P and the
double polarization observable H are discussed for $\pi^{0}$ and $\eta$
photoproduction off the proton.
