  The search for $D^0\bar{D}^0$ mixing may carry a large discovery potential
for new physics. This paper discusses the techniques, current experimental
status, and future prospects for the mixing search. Some new ideas, applicable
to future mixing searches, are introduced. In this paper, the importance of
separately measuring the decay rate difference and the mass difference of the
two CP eigenstates (in order to observe New Physics) has been emphasized, since
the theoretical calculations for long distance effects are still plagued by
large uncertainties.
