  We perform a systematic study of CP-violating observables in \ddbar\ decays.
We show that given a final state, which may be a CP eigenstate or not, all the
observables can in principle be measured if decay-time information is available
and if, for CP non-eigenstates, both decay rates into $f$ and $\bar f$ are
considered. As an illustration of our analysis we discuss an effective
superweak scenario.
