  Some general remarks on parton transverse spin distributions and transverse
motions are presented. The issue of accessing experimental information on the
transversity distributions h_1^q is discussed. In particular direct information
could be obtained from Drell-Yan processes with polarized protons and
antiprotons (planned at GSI), while indirect information, coupling h_1^q to the
Collins fragmentation function, is being gathered by HERMES and COMPASS
collaborations. The related issue of transverse Single Spin Asymmetries (SSA)
measured in several processes and the role of the Sivers distribution function
is also discussed.
