Theoretical uncertanties in the determination of ${\alpha }_s$ from hadronic event observables: the impact of nonperturbative effects

Abstract

I review the theoretical status of hadronization corrections to hadronic event observables and discuss their impact on the determination of ${\alpha }_s$.

talk presented at Annual Meeting of Division of Particles and Fields of the APS (DPF`96), Minneapolis, MN, August 10--15, 1996; 7 pages LATEX, sprocl.sty required (included)