2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147952Hadronization corrections to the predictions of perturbative QCD are reviewed. The existing models for the conversion of quarks and gluons into hadrons are summarized. The most successful models give a good description of the data on $e^+e^-$ event shapes and jet fragmentation functions, and suggest that the dominant hadronization effects have a $1/Q$ dependence on the hard process energy scale $Q$. In several cases the $1/Q$ terms can be understood in terms of a simple longitudinal phase-space model. They can also be inferred by relating non-perturbative renormalon effects to the infrared cutoff dependence of perturbative contributions.Lectures at Summer School on Hadronic Aspects of Collider Physics, Zuoz, Switzerland, August 1994; 29 pages latex, 12 figures uuencoded postscript. Citation of relevant work by I.I.Balitsky and V.M.Braun, Nucl. Phys. B361(1991)93, added 30 Nov 1994High Energy Physics - Phenomenologytext