  Physics at the Large Hadron Collider (LHC) and the International e+e- Linear
Collider (ILC) will be complementary in many respects, as has been demonstrated
at previous generations of hadron and lepton colliders. This report addresses
the possible interplay between the LHC and ILC in testing the Standard Model
and in discovering and determining the origin of new physics. Mutual benefits
for the physics programme at both machines can occur both at the level of a
combined interpretation of Hadron Collider and Linear Collider data and at the
level of combined analyses of the data, where results obtained at one machine
can directly influence the way analyses are carried out at the other machine.
Topics under study comprise the physics of weak and strong electroweak symmetry
breaking, supersymmetric models, new gauge theories, models with extra
dimensions, and electroweak and QCD precision physics. The status of the work
that has been carried out within the LHC / LC Study Group so far is summarised
in this report. Possible topics for future studies are outlined.
