  This Report summarizes the proceedings of the 2017 Les Houches workshop on
Physics at TeV Colliders. Session 1 dealt with (I) new developments relevant
for high precision Standard Model calculations, (II) theoretical uncertainties
and dataset dependence of parton distribution functions, (III) new developments
in jet substructure techniques, (IV) issues in the theoretical description of
the production of Standard Model Higgs bosons and how to relate experimental
measurements, (V) phenomenological studies essential for comparing LHC data
from Run II with theoretical predictions and projections for future
measurements, and (VI) new developments in Monte Carlo event generators.
