2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185154This article provides a review of progress made in understanding inverse power law corrections 1/Q^p where Q is the hard scale for a given QCD observable. Special emphasis is given to comparisons of theory with HERA results.10 pages, 5 figures. Contribution submitted to Ringberg workshop on HERA physics, Ringberg Castle, June 2001High Energy Physics - Phenomenologytext