Sources of International Law - General Principles of Law

General Principles of Law

The scope of general principles of law, to which Article 38(1) of the Statute of the ICJ refers, is unclear and controversial but may include such legal principles that are common to a large number of systems of municipal law. Given the limits of treaties or custom as sources of international law, Article 38(1) may be looked upon as a directive to the Court to fill any gap in the law and prevent a non liquet by reference to the general principles.

In earlier stages of the development of international law, rules were frequently drawn from municipal law. In the 19th century, legal positivists rejected the idea that international law could come from any source that did not involve state will or consent, but were prepared to allow for the application of general principles of law, provided that they had in some way been accepted by states as part of the legal order. Thus Article 38(1)(c), for example, speaks of general principles "recognised" by states. An area that demonstrates the adoption of municipal approaches is the law applied to the relationship between international officials and their employing organisations, although today the principles are regarded as established international law.

The significance of general principles has undoubtedly been lessened by the increased intensity of treaty and institutional relations between states. Nevertheless, the concepts of estoppel and equity have been employed in the adjudication of international disputes. For example, a state that has, by its conduct, encouraged another state to believe in the existence of a certain legal or factual situation, and to rely upon that belief, may be estopped from asserting a contrary situation in its dealings. The principle of good faith was said by the ICJ to be "ne of the basic principles governing the creation and performance of legal obligations". Similarly, there have been frequent references to equity. It is generally agreed that equity cannot be employed to subvert legal rules (that is, operate contra legem). This "equity as law" perception is reinforced by references to equitable principles in the text of the United Nations Convention on the Law of the Sea 1982, though this may be little more than an admission as to the existence, and legitimation, of the discretion of the adjudicator.

However, the principles of estoppel and equity in the international context do not retain all the connotations they do under common law. The reference to the principles as "general" signify that, if rules were to be adapted from municipal law, they should be at a sufficient level of generality to encompass similar rules existing in many municipal systems. Principles of municipal law should be regarded as sources of inspiration rather than as sources of rules of direct application.