Transversity distribution in spin asymmetries in semi-inclusive DIS and   in the Drell-Yan process
  A review is given on single spin asymmetries in deep inelastic semi-inclusive scattering (SIDIS) and their possible theoretical understanding in the framework of QCD-induced factorization approach, wherefore predictions for transversity from the chiral quark soliton model are used. Arising difficulties to interpret most recent SIDIS data, and the possibility to access the transversity distribution in the Drell-Yan process are discussed. 
A.V. Efremov, K. Goeke and P. Schweitzer