2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44939This talk summarizes the status of the charmonium system, with particular emphasis on outstanding problems in QCD spectroscopy which a tau-charm factory can address.Summary report for the Charmonium Working Group at the Third International Workshop on a Tau-Charm Factory, Marbella, Spain (1-6 June 1993), 12 pages, LATEX using epsfig and wrapfig, 5 postscript files available from the author at tbarnes@orph13.ornl.gov, ORNL-CCIP-93-11 / RAL-93-065High Energy Physics - Phenomenologytext