Sources of International Law

International Law: an Overview

Traditionally, international law consisted of rules and principles governing the relations and dealings of nations with each other, though recently, the scope of international law has been redefined to include relations between states and individuals, and relations between international organizations. Public_international_law, concerns itself only with questions of rights between several nations or nations and the citizens or subjects of other nations. In contrast, Private_international_law deals with controversies between private persons, natural or juridical, arising out of situations having significant relationship to more than one nation. In recent years the line between public and private international law have became increasingly uncertain. Issues of private international law may also implicate issues of public international law, and many matters of private international law have substantial significance for the international community of nations.

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Domains of International Law

International Law includes the basic, classic concepts of law in national legal systems -- status, property, obligation, and tort (or delict). It also includes substantive law, procedure, process and remedies. International Law is rooted in acceptance by the nation states which constitute the system. The following are major substantive fields of international law:

• International economic law

• International security law

• International criminal law

• International environmental law

• Diplomatic law

• International humanitarian law or law of war.

• International human rights law

Sources of International Law

Customary law and conventional law are primary sources of international law. Customary international law results when states follow certain practices generally and consistently out of a sense of legal obligation. Recently the customary law was codified in the Vienna Convention on the Law of Treaties. Conventional international law derives from international agreements and may take any form that the contracting parties agree upon. Agreements may be made in respect to any matter except to the extent that the agreement conflicts with the rules of international law incorporating basic standards of international conduct or the obligations of a member state under the Charter of the United Nations. International agreements create law for the parties of the agreement. They may also lead to the creation of customary international law when they are intended for adherence generally and are in fact widely accepted. Customary law and law made by international agreement have equal authority as international law. Parties may assign higher priority to one of the sources by agreement. However, some rules of international law are recognized by international community as peremptory, permitting no derogation. Such rules can be changed or modified only by a subsequent peremptory norm of international law.

General principles common to systems of national law is a secondary source of international law. There are situations where neither conventional nor customary international law can be applicable. In this case a general principle may be invoked as a rule of international law because it is a general principle common to the major legal systems of the world and not inappropriate for international claims.