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 Ξc0,+ baryons; semileptonic branching ratios of Ds, Λc and Ξc hadrons and absolute branching ratios for those states;
radiative decays D→γK∗,γρ/ω,Ds→γϕ/ω,D→l+l−K/K∗; D0−Dˉ0
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 τ-charm factory can fill the
bill.Comment: 9 pages, LATEX, preprint CERN-TH.7370/9