  One of the missing keys in the present understanding of the spin structure of
the nucleon is the contribution from the gluons: the so-called gluon
polarisation. This quantity can be determined in DIS through the photon-gluon
fusion process, in which two analysis methods may be used: (i) identifying open
charm events or (ii) selecting events with high p_T hadrons. The data used in
the present work were collected in the COMPASS experiment, where a 160 GeV/c
naturally polarised muon beam, impinging on a polarised nucleon fixed target is
used. Preliminary results for the gluon polarisation from high p_T and open
charm analyses are presented. The gluon polarisation result for high p_T
hadrons is divided, for the first time, into three statistically independent
measurements at LO. The result from open charm analysis is obtained at LO and
NLO. In both analyses a new weighted method based on a neural network approach
is used.
