2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46422I briefly review three topics of recent interest concerning power corrections, renormalons and Sudakov resummation: (a) $1/Q$ corrections to event shape observables in $e^+ e^-$ annihilation, (b) power corrections in Drell-Yan production and (c) factorial divergences that arise in resummation of large infrared (Sudakov) logarithms in moment or `real' space.11 pages, LaTeX, sprocl.sty provided (To appear in the Proceedings of the 28th International Conference on High Energy Physics, Warsaw, Poland, 25-31 July 1996)High Energy Physics - Phenomenologytext