  The origin of Galactic cosmic rays is still a burning question that forms a
major motivation for developments in ground-based gamma-ray astronomy. SNRs are
long-thought to be sites for the acceleration of Galactic cosmic rays, and
evidence for gamma-ray and non-thermal X-ray production from some SNRs suggest
that they may be capable of accelerating particles to multi-TeV energies. Yet,
along with this, and in the same overall model framework (diffusive shock
acceleration), is the need to accommodate upper limits at TeV energies imposed
on other examples. This review will present an update on the status of SNR
observations at TeV energies, their interpretation, and discuss the relevant
parameters and issues of next generation ground-based instruments relating to
their ability to confirm SNRs as Galactic cosmic ray sources.
