This microhistoric study researches the co-operation of two Enlightenment scholars, Joseph Nicholas the Count de Windischgratz and the Marquis de Condorcet, on a joint project of the then popular political arithmetic, which aimed to apply a mathematical model upon political acts and thus ensure their precise and indisputable outcome. The academic competition, for which Count de Windischgrätz invited applications in the 1780s stimulated international discussions in which fifty scholars and politicians from different countries, including five important European Academies of Science and Learned Societies, participated. The correspondence network, which was established thanks to this Project, connected a large part of Europe and thus fulfilled the idea of a supranational and suprastate „institution" of the Republic of the Learned. This study primarily focuses upon the manner in which this Project gained international recognition, and on the communication and exchange of academic works, information and opinions between its two main protagonists, Condorcet and Windischgratz. [ABSTRACT FROM AUTHOR]