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As the DOE representative in these international STI exchanges, OSTI provides the U.S. input using the ETDE/INIS Joint Thesaurus, which contains the controlled terminology for indexing all information within the subject scopes of the International Nuclear Information System (INIS) and the Energy Technology Data Exchange (ETDE). It contains 21,147 valid descriptors and 9,114 forbidden terms. The terminology is intended for use in subject descriptions for input or retrieval of information in these systems. The vocabulary is updated routinely, therefore please refer to the supplements for cumulative references for changes made to the initial printing of the thesaurus.