An arbitration clause with a bipartite structure is not in principle incompatible with a plurality of parties, provided that a spontaneous grouping of the interests at stake into two homogeneous and concretely opposing groups is achieved, and provided that the specific dispute is in itself compatible with the bipolar structure of the clause.
Where the claim brought presupposes the interpretation of a clause of the agreement containing the arbitration clause which refers to arbitrators disputes concerning the interpretation and performance of that agreement, such interpretation is reserved to the arbitrators, with the consequent lack of jurisdiction of the ordinary court in favour of the arbitral tribunal.