Conflict-of-laws rules that serve as application-of-law rules are necessary everywhere where legally relevant facts and circumstances of life have points of contact with different legal systems. In classic international law of procedure this has to do with the removal of layers of applicability of national legal systems, which today is based on the question of which legal system has the closest connection to a given state of facts. With European integration, a new independent supranational legal system has been added to the individual national legal systems, which influences national law in diverse ways.