This paper first outlines the history from the manual output of Currnt Bibliography on Science & Technology in 1958 up to the present moment of operating JICST online service through terminals by use of public communication line, and describes subject coverage of JICST files, selection criteria of articles to be included in the files, and data elements outputted along with some examples. The classification structure as well as fundamental policy on assigning keywords and classification codes, and the corresponding examples are also indicated. Then it explains some matters to be paid attention when searching, examples of simple retrievals, searcher's aid on JICST Thesaurus, etc., and training seminars for users. Through the whole sections in this paper some modifications or change on JOIS-I, which are found in JOIS-II, are commented if necessary.
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