  A formally exact set of equations is derived for the description of
nonequilibrium phenomena in classical liquids and glasses. With the help of a
non equilibrium projection operator formalism, the correlation functions and
fluctuation propagators are expressed in terms of memory functions and time
dependent collective frequencies. This formally exact set of equations is
approximated by applying mode coupling approximations to the memory functions.
The resulting set of equations for wavevector dependent correlation functions,
fluctuation propagators and one-time structure factors $S_q(t)$ generalizes the
well known mode coupling theory of the glass transition to situations far away
from equilibrium.
