Traditionally, public international law and private international law were perceived as two distinct categories of law; the former governs the international relations between states and the latter those between private individuals. Their relationship is based upon an evolutionary development from private to public, and from municipal to international, law. In the modern world, this evolution has culminated in a dynamism reflected in numerous interactions between a wide range of different actors. As a result, the former boundaries between the public and private law, as well as the international and municipal law dichotomy, have become blurred. In an emerging global society, these four major categories have entered into a dynamic dialogue that challenges, equally both legal theory and practice. This dialogue is centred around a functioning global legal framework, in which public international law and private international law can, due to their distinct scopes of application, answer many unanswered questions, providing that they speak with one voice.