  Contents :
  1. Pre-history
  2. Transversity versus helicity
  3. The massless limit. "Cardan" and "see-saw" transformations
  4. Transversity distribution delta q(x). The diquark spectator model
  5. Soffer inequality
  6. Tensor charge sum rule
  7. t-channel analysis
  8. Selection rules for delta q(x) measurements
  9. Evolution with Q squared
  10. Quark polarimetry. The sheared-jet (Collins) effect
  11. Single-spin asymmetries in inclusive experiments
  12. Quark distribution dependent on both spin and transverse momentum
  13. First evidence of quark transversity
