2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/53494Lectures given at the Trieste Summer School, 1992. These notes are an update of my review article "Classical and Quantum W-Gravity", preprint QMW-92-1, published in in "Strings and Symmetries 1991", with some extra material on W-geometry, W-symmetry in conformal field theory and W-strings.67 pages, QMW-93-2High Energy Physics - Theorytext