"The D0 QCD group reported earlier (December, 1995) results 
          from the inclusive jet study. The main conclusion was that for
          the central rapidities (eta < 0.5) there is excellent agreement
          with Next-to-Leading Order (NLO) theory. Data show no deviation
          from theory at any jet Et. 

               Such a conclusion would contradict earlier CDF reports where
          a deviation from the NLO QCD was observed at highest ET inclusive 
          jet spectrum. It also produces somewhat uncomfortable feeling about
          the preliminary results from the Large Ht analysis at D0.    

               We overlayed the CDF and D0 results and found that they are
          in excellent agreement in measured cross-section with exception of
          the highest Et end. Above some 350 GeV D0 has fewer events. The D0
          and CDF results agree though within one standard deviation band
          determined by the systematic errors of the D0 analysis (mostly due
          to uncertainty in the jet energy scale correction). Based on that,
          in our view, the D0 result does not disprove the earlier CDF 
          conclusion but fewer number of events at high Et end calls for some
          attantion in particular when compared with a preliminary result of
          the Large Ht analysis at D0. 

               The D0 inclusive jet analysis is based on a comparison of the
          "unsmeared" collider data with theory. This is not a standard method
          for most of other analyses at D0. The standard method smears the 
          monte-carlo data to allow for comparison with collider data. A great
          deal of effort went to develop this method which was tuned with both 
          test beam and collider calorimeter data. The inclusive jet analysis
          uses NLO JETRAD physics simulation. This simulator is at a parton 
          level only and can not be processed with standard D0 reconstruction
          program so the collider data must be "unsmeared" to compare with the
          theory. The "unsmearing" method is known to have strong systematic
          errors in particular for jets at high Et end. 
 
               A study of the LO vs NLO theory shows that the O(alpha_s^3)
          leads to a measurable deviation from the LO only for high Et jets 
          produced at high rapidities ( > 2 ). Therefore, one should not 
          expect any measurable deviation in the inclusive jet spectrum for
          the rapidity range < 0.5 as used in D0 study. In fact, the NLO was 
          introduced in order to explain the CDF deviation but failed to do 
          that. The CDF data were tested within rapidity range less than 0.7. 

              Consequently, one can use the LO simulations (Herwig or Pythia)
          for inclusive jets study at low rapidity range and then apply 
          standard D0 reconstruction technique. If indeed there is a 
          discrepancy with the CDF result it has to show up in the standard 
          analysis method as well.