The Japan Information Center of Science and Technology(JICST)developed JICST free term file which enabled searchers to search JICST Files by free term, and loaded on JOIS-III , new version of JICST Online Information System. The authors outline its system and the process of development of this file, and show how to use it in JOIS-III, giving explanations on the necessary search commands. In addition, how to search homograph, homonym and term with identifier, etc., are shown by using sample output. To enhance its functions to find optimal term, FT-CT co-word dictionary constructed through co-word analysis, which lists up controlled terms appeared in the article concurrently with its title words(free term) in the order of frequency, is merged into FT-CT conversion dictionary which was constructed manually. The number of free terms in this file amounts to some 310,000.
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