  Quantum Chromodynamics has been studied extensively at Fermilab's Tevatron
collider. Between 1992 and 1996 the D{\O}and CDF experiments, each accumulated
approximately $100 \mathrm{pb}^{-1}$ of proton-antiproton collisions at a
center-of-mass energy $\sqrt{s}=1800 \mathrm{GeV}$ and $\sim 0.5
\mathrm{pb}^{-1}$ at $\sqrt{s}=630 \mathrm{GeV}$. 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.
