'How are theatre scholars sharing information about people, places, and performance? This essay considers the current prospects for collaborative research on theatre production within the context of recent developments in the digital humanities. It identifies convergence in the way that twelve projects around theworld are collecting and organizing information about performance: Abbey Theatre Archives Performance Database (Ireland); AusStage (Australia); Hamm Archives, Brooklyn Academy of Music (US); Global Performing Arts Database (US, Singapore, Japan, Russia, China); IbsenStage (Norway); Internet Broadway Database (US); Staging Beckett (England); Scottish Theatre Archive (Scotland); TheaterEncyclopedie (Netherlands); Theatre Aotearoa (New Zealand); Theatrescapes (Germany); and Toronto Theatre Database (Canada). The essay derives core descriptions for shared concepts from the data models in use, placing emphasis on practical solutions, while recognizing variations in implementation. In the process it distinguishes four levels of determination for concepts of performance, event, production, and work. Recognizing what has been achieved, the essay contributes to the prospects of sharing data among projects. It concludes by illustrating how visualizing information on performance opens new horizons of significance for theatre research at scales ranging from local activity to global networks.' (Publication summary)