Principle of Concentration of Arguments

Three unities are required traditionally in fulfillment on res judicata. In French Law, this condition is provided in art. 1351 of Civil Code. Despite this article, French cour de cassation in a judgment so called Cesareo in 2006, removed the unity of cause from the conditions of res judicata. Subsequently principle of concentration of arguments (principe de concentration des moyens) was established in French Law. In Iranian Law, despite the fact that doctrine does not hesitate in necessity of unity of cause res judicata, in positive law there is no sign of this condition. Accordingly, Iranian Jurisprudence does not regard unity of cause as a necessary condition of res judicata. Creation of Principle of Concentration of Arguments in French law and subsequently, appearance of critical discussions about this principle, rendered an opportunity in Iranian Law to reconsidering the conditions of fulfillment of res judicata in positive law and jurisprudence?