Measurements of Higher Order Effects in QCD from the Tevatron Collider

Quantum Chromodynamics has been studied extensively at Fermilab’s Tevatron collider. Between 1992 and 1996 the D{\O}and CDF experiments, each accumulated approximately $100{\mathrm{p}\mathrm{b}}^{-1}$ of proton-antiproton collisions at a center-of-mass energy $\sqrt{s}=1800\mathrm{G}\mathrm{e}\mathrm{V}$ and $\sim 0.5 $\mathrm{p}\mathrm{b}$^{-1}$at$\sqrt{s}=630 $\mathrm{G}\mathrm{e}\mathrm{V}$$. In this paper, we present selected recent measurements of higher order effects in QCD: multiple jet production and subjet and charged particle multiplicities in quark and gluon jets.