The Beam Delivery System (BDS) is a critical component of a
high-energy linear collider. It transports the beam from the
accelerator and brings it to a focus at the Interaction Point. The
BDS system includes diagnostic sections for measuring the beam
energy, emittance, and polarization, as well as collimators for
machine protection. The length of the BDS increases with collision
energy. Higher collision energies also require higher luminosities,
and this is a significant constraint on the design for
energy-frontier machines. Here, we review BDS designs based on
traditional quadrupole magnets and examine the challenges involved
in extending these to the Multi-TeV regime consistent with
requirements for advanced accelerator concepts.