Measurement of TMDs in Semi-Inclusive DIS

Over the past decades, the colinear parton model has been very successful in describing the structure of nucleons. However, in the past years it became evident, that to fully describe the structure of the nucleon this picture has to be extended taking into account the transverse momentum of the partons. This gives rise to a new set of distribution and fragmentation functions entering the cross sections, namely the transverse momentum dependent (TMD) functions.The measurement of these functions in semi-inclusive deep inelastic scattering (SIDIS) in the framework of the COMPASS and HERMES experiments is presented in this contribution.