  We present the possibilities for doing luminosity levelling at the LHC. We
explore the merits and drawbacks of each option and briefly discuss the
operational implications. The simplest option is levelling with an offset
between the two beams. Crab cavities may also be used for levelling, as may a
squeezing of the beam. There is also the possibility of using the crossing
angle in order to do luminosity levelling. All of these options are explored,
for the LHC and other possible new projects, together with their benefits and
drawbacks.
