2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46899We review the recent theoretical progress in the construction and solution of the evolution equations which govern the scale dependence for the twist-three structure and fragmentation functions of the nucleon.49 pages, LaTeX, 13 eps figures; Lecture given at the XXXI PNPI Winter School on Nuclear and Particle Physics, St. Petersburg, Repino, February 24 - March 2, 1997High Energy Physics - Phenomenologytext