2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48474Various QCD studies based on jet observables in hadronic final states in deep-inelastic scattering and hadron-hadron collisions are presented. Measured quantities are event shape variables, jet rates and jet cross sections. QCD analyses have been performed to determine the value of the strong coupling constant $α_s(M_z)$, the gluon density in the proton and to test power corrections.6 pages, 10 figures, to appear in the proceedings of the 29th International Conference on High Energy Physics (ICHEP'98), Vancouver, Canada, 1998High Energy Physics - Phenomenologytext