Progress in Spin and 3D Nucleon Structure

An overview on studies of the nucleon spin puzzle is given as they are performed in polarised deep-inelastic lepton-nucleon scattering experiments and polarised proton-proton collisions. By now, good knowledge is obtained on the contribution of quark spins to the nucleon spin, while the information about the gluon contribution is still scarce. Currently, the focus is on the study of the orbital angular momentum contribution that is related to the 3-dimensional structure of the nucleon. It is accessible via generalised parton distributions that can be measured in exclusive photon and meson production in lepton scattering experiments. Here, an active experimental and theoretical program is ongoing.