  The two-dimensional (2-D) quantum gravity coupled to the conformal matter
with $c=1$ is studied. We obtain all the three point couplings involving
tachyons and/or discrete states via operator product expansion. We find that
cocycle factors are necessary and construct them explicitly. We obtain an
effective action for these three point couplings. This is a brief summary of
our study of couplings of tachyons and discrete states, reported at the
workshop in Tokyo Metropolitan University, December 4-6, 1991.
