Doctrinal treatment of the effectiveness of legal regulation -- Characteristics and implications of the effectiveness of legal regulation -- The essence of the threshold of legal regulation -- Customary law and inherent rules -- Fact as non-law and the limits on its relevance -- Interest as non-law -- Values as non-law -- Quasi-normative non-law -- Conceptual aspects of interpretation -- Treaty interpretation : rules and methods -- Treaty interpretation : effectiveness and presumptions -- Interpretation of jurisdictional instruments -- Interpretation of unilateral acts and statements -- Interpretation of institutional decisions -- Interpretation of customary rules -- The agencies of interpretation -- The essence of and response to the indeterminacy of treaty provisions -- Equity and equitable considerations in treaties.