At the moment I'm trying to figure out the origin of the term ludology. It seems Jesper Juul is able to pin-point 1982 as the year in which Mihaly Csikszentmihalyi may have coined the term. Encyclopædia Britannica does in fact not have any registration of the word. And Stewart Culin it seems does not use the term, even though Binsbergen address him by the title of ludologist.