By the rapid development of an electronic computer, information processing has now lost its novelty. Japan Society for the Promotion of Machine Industry has made a special study of IR system by using an electronic computer for about five years since 1962. First, in an early stage in our study, an investigation with foreign literatures had been made to grasp the general idea of IR system clearly, while an experiment by aperture card system was made to a subject 'Informations about automobiles' as an experimental trial of IR. Next, as a step into the stage of IR system by magnetic tapes, a thesaurus of social science (involving about 10,000 terms of economic industry) was drawn up and on the basis of this thesaurus' provisional questions' prepared, with which the actual research was tried. Besides, in order to grasp the relevancy to these questions, the analysis of effectiveness, invalidity and the rate of relevancy was made to the result of the research. Finally, it is emphasized that the above results are strictly those of the experiment with a plot-type thesaurus and hoped to be able to increase the rate of the relevancy to questions and also correct or revise the thesaurus by repeating the experiments in future.
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