  We propose a set of measurements at a charm factory to determine the
$D^0-\bar D^0$ mixing parameters $\Delta M$ and $\Delta\Gamma$ and the strong
phase difference $\delta$ between doubly-Cabibbo-suppressed (DCS) and
Cabibbo-favored (CF) neutral $D$ decays into $K^-\pi^+$. The method can also be
used to measure strong phase differences between other corresponding DCS and CF
amplitudes. These phase differences are important for studies of $D^0$--$\bar
D^0$ mixing.
