1. Definition: A treaty can be defined as an agreement (usually written) between 2 or more States (or a State/group of States and IGO, or IGOs) governed by international law and intended to create legal obligations.
  2. Classes:
  • By nature: law-making treaties/treaty contracts.-
  • By number of parts: bilateral/multilateral
  • By reservations: package-deal treaties and non-package deal treaties.
  1. Functions.
  • Purport to codify existing rules of customary law.
  • Crystallize a developing rule of law, firmly establishing on a legal footing, a situations which has previously been part of the practice of a limited number of States.
  • Generate rules of law independently of the previous practice of the States.