  Measuring the total cross sections of top-quark pair production and single
top processes at high precision tests the predictions of the Standard Model and
can bring better understanding of properties such as the top-quark mass,
electroweak couplings, lepton universality and proton parton distribution
functions. Some of the recent measurements by the ATLAS and CMS experiments at
the Large Hadron Collider are outlined in this document. Experimental methods
are given particular attention, particularly the determination of lepton
isolation efficiencies in the ATLAS dilepton measurement of top-quark pair
production.
