  We investigate the need and prospects for measuring dark matter properties at
particle collider experiments. We discuss the connections between the inferred
properties of particle dark matter and the physics that is expected to be
uncovered by the Large Hadron Collider (LHC) and the International Linear
Collider (ILC) and motivate the necessity of measuring detailed dark matter
properties at a collider. We then investigate a model-independent signature of
dark matter at a collider and discuss its observability. We next examine the
prospects for making precise measurements of dark matter properties using two
example points in minimal supergravity (mSUGRA) parameter space. One of the
primary difficulties encountered in such measurements is lack of constraint on
the masses of unobservable heavy states. We discuss a new method for
experimentally deriving estimates for such heavy masses and then conclude.
