  A brief review of progress and issues in hadronic theory and phenomenology is
presented. New results for the $X(3872)$, $Z_c(3900)$, and $Z_c(4020)$ are
discussed and unresolved issues are highlighted. A series of open problems in
pQCD, NRQCD, and general phenomenology is given. It is argued that these
indicate that the current understanding of hadronic dynamics is poor. In
particular old ideas about quark annihilation and factorisation appear to be
incorrect, pQCD looks limited in scope, and the convergence of some NRQCD
computations appears jeapardised by the relative lightness of the charm quark
mass.

High Energy Physics - Phenomenology