This is the summary report of the energy frontier QCD working group prepared\ud for Snowmass 2013. We review the status of tools, both theoretical and\ud experimental, for understanding the strong interactions at colliders. We\ud attempt to prioritize important directions that future developments should\ud take. Most of the efforts of the QCD working group concentrate on proton-proton\ud colliders, at 14 TeV as planned for the next run of the LHC, and for 33 and 100\ud TeV, possible energies of the colliders that will be necessary to carry on the\ud physics program started at 14 TeV. We also examine QCD predictions and\ud measurements at lepton-lepton and lepton-hadron colliders, and in particular\ud their ability to improve our knowledge of strong coupling constant and parton\ud distribution functions
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