The properties of three-jet events in data of integrated luminosity 86 \pm 4 pb^-1 from CDF Run 1b and with total transverse energy greater than 175 GeV have been analyzed and compared to predictions from a next-to-leading order perturbative QCD calculation. Special emphasis is placed on analysis of the Dalitz variables. Posted to /cdf/pub/thesis/cdf6225_three_jet_vs_NLO.ps http://www-cdf.fnal.gov/thesis/cdf6225_three_jet_vs_NLO.ps Posted by seidel@cdfsga