Gluon polarisation measurements at COMPASS

The COMPASS experiment at CERN is studying the nucleon spin structure in polarized deep inelastic muon scattering. COMPASS is using a 160 GeV/c muon beam on a polarized LiD target. The gluon polarization in the nucleon is accessible via the photon-gluon fusion process. The latter can be tagged either by the production of open charm or by pairs of light hadrons with high transverse momenta. The talk presents the analysis methods, the status of the reconstruction of open charm via D-mesons, and the status of the asymmetry measurement for pairs of hadrons with high transverse momenta.