title: Customary International Law: An Instrument Choice Perspective
abstract: This Article proceeds as follows. Part II begins by considering custom’s design features, which the authors distinguish from the canonical elements of custom (state practice and opinio juris) and the individual doctrines associated with CIL. Specifically, they contend that, as an ideal-type, custom is non-negotiated, unwritten, and universal, three characteristics that distinguish CIL from both treaties and soft law, which are almost always negotiated, written, and rarely universal either in for
journal: eYLS (Yale Law School)