  The potential of the LHeC, a future electron-proton collider, for precision
Deep Inelastic Scattering measurements is reviewed with particular emphasis on
the reduction of uncertainties on the parton distribution functions (PDFs) of
the proton. The interpretation of possible Beyond Standard Model (BSM) signals
at the LHC is crucially dependent on precise knowledge of the predictions of
the Standard Model (SM) and the uncertainties on PDFs are a limiting factor.
The LHeC project, running in parallel with later stages of LHC running, would
provide much improved precision on the PDFs as compared to the precision
expected from LHC data alone.
