2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48608Contents: 1. Introduction; 2. The First Moment Sum Rule for $g_1^p$; 3. The Parton Model and the `Proton Spin'; 4. The CPV Method and Topological Charge Screening; 5. Experiment; 6. Semi-Inclusive Polarised DIS.Lecture at the International School of Subnuclear Physics, `From the Planck Length to the Hubble Radius', Erice, 1998. 22 pages, plain TeX, 2ps or eps figuresHigh Energy Physics - Phenomenologytext