2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48625This paper gives a pedagogical introduction to our knowledge of the spin structure of the nucleon. In particular, polarised deep inelastic lepton scattering is presented as a tool to study how the nucleon's constituents combine to generate its spin. The importance of semi-inclusive measurements is discussed and a window on future experiments in the field is given.51 pages, 24 figures, Latex, psfigure.sty, rotating.sty, sprocl.styHigh Energy Physics - Phenomenologytext