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PAIL Guide to Procedural International Law

I.  Sources

Essential to understanding international law is knowing the sources of international law rules. How do international law norms get created? Where does one, quite literally, look for the law?

A.  Custom

Custom refers to customary international law, the unwritten and uncodified practices of States and other international actors that can constitute a relevant and useful source of international legal obligation.

B.  Treaties

Treaties are the actual written and formal international agreements entered into by States.