The main focus of the HERMES experiment is the experimental investigation of the spin structure of the nucleon. For Run II of HERMES one of the main topics is the study of the transverse spin structure of the nucleon. Using a transversely polarised hydrogen target single-spin asymmetries are measured in semi-inclusive electro-production of charged and neutral pions in deep inelastic scattering. Two different azimuthal dependences that can be related to the transversity distribution are extracted.

PACS numbers: 12.38.--t, 13.60.--r, 13.88.+e, 14.20.Dh