This case arises out of the troubled relationship which developed between the parties to a 1995 “Concession Agreement” which privatised (as it turned out, unsuccessfully) the water and sewage services of the Province of Tucumán (“Tucumán” or the “Province”) in the Argentine Republic (“Argentine Republic” or “Argentina”). The original signatories to the Concession Agreement were a French company, Compagnie Générale des Eaux (“CGE” now Vivendi Universal S.A., “Vivendi”), its Argentine affiliate, Compañia de Aguas del Aconquija S.A. (“CAA”) Benito Roggio e Hijos S.A. (“Roggio”), Dragados y Construcciones (“DYCASA”), and the Province.