  A list is given of those open questions concerning the dynamics of charm
decays where there exists a strong need for an answer. Such a need is based on
lessons to be learnt about QCD -- either in their own right or for a better
understanding of $B$ physics -- or on searches for New Physics with a small
background from the Standard Model. The major items on this list are: lifetimes
of the $\Xi _c^{0,+}$ baryons; semileptonic branching ratios of $D_s$, $\Lambda
_c$ and $\Xi _c$ hadrons and absolute branching ratios for those states;
radiative decays $D\rightarrow \gamma K^*,\, \gamma \rho /\omega , \, D_s
\rightarrow \gamma \phi /\omega ,\, D\rightarrow l^+l^-K/K^*$; $D^0-\bar D^0$
oscillations down to a sensitivity below $10^{-4}$ and CP asymmetries in
non-leptonic $D$ decays down to 0.1\%. Ongoing and already approved experiments
will produce important new insights, which are unlikely to provide sufficient
answers to all these questions yet. It is discussed how a third-generation
fixed-target experiment like CHARM2000 or a $\tau$-charm factory can fill the
bill.
