The database for educational information called EDMARS is the first one established in Japan. This database system is devoted to the study of educational phenomena and the use for various purposes, and the both have recently begun to function. The people concerned submitted the reports for it. This issue does not only a role of the open reports but also a guideline for various usage of a database. The database is a storage of literature and documents here on all kinds of educational activities. Every material found in the system should anytime be retrieved and used when required. From this point of view the community of education is far back from that of science and technology, chronologically, quantitatively and qualitatively. Particularly weak points can be found at the input stage e.g. in selection of descriptors. At the output stage, the quality of the system depends mainly on the documentation and feedback function at various steps of prosessing probably from the FAIRS system adopted. EDMARS would not have been able to help weak points therein. Those faults, however, would not easily permitted as a reliable database. The users of the database are expected to participate in bettering the system. Then this issue will be worth publishing.

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A proposal of constructing educational document retrieval system was raised in 1976 for the celebration of centennial anniversary of the modern education system in Japan. The substantial study on a computerized retrieval system for educational documents, however, started in 1976 at Kyoto University of Education. In the first phase of development (1976-80), problems to be tackled were to accumulate educational documents in a computer, to process them by using the computer, and to extract keywords to be utilized in retrieving proper items from the data-base of the accumulated documents. For this purpose, 2,714 keywords were extracted from 1,693 titles of academic papers published in the fields of educational research, educational psychology and educational technology in Japan. It was recognized that these extracted words were not sufficient for the efficient retrieving of documents and appended by words extracted from three educational dictionaries. In the second phase of develoment (1981- ), members of Gifu University took devoted responsibities to collect a wider range of educational documents published in various fields of research and to construct the thesaurus of descriptors required for the efficient retrieving.

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This paper describes technical problmes of maintaining and managing database of educational documents (EDMARS). To check the accuracy of input data, three areas 'such as education of phisics, education of mathematics and educational psychology were selected. Then their data and the content of original papers were carefully compared. As a result, quite many discordances between data base and original papers were found. Main discordances were caused by the following : (1) simple typing error (2) misplaced words (3) missing part of a title (4) original discordance between a paper and its contents (5) use of kanji characters which do not exist on standard machine code (6) mistransformation from an uppercase letter to a lowercase letter and hiragana to katakana and vice versa. This paper discusses counter-measures against above-mentioned causes at each step of collection, input and modification.

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This paper describes the procedure of solving some technical problems in an information retrieval system for public users. To achieve the above-mentioned objective, the following pre-arrangements were needed: (1) to select keywords from the database of Curriculum Research and Development Center of Gifu University. (2) to resolve keywords into its word bases and to create a corresponding chart of keywords and word bases. (3) to provide phonetic information of both author's names and word bases. Adding to the previously mentioned arrangement, information retrieval system connected through telephone line, which can be displayed in Japanese, was developed. The characteristics of this system are as follows: (1) On the supposition of using a micro computer as a terminal unit for public users, the system can convert an information in Roman characters to Japanese characters (kanji and hiragana). In case of a terminal unit without kanji character display, messages in Roman characters are also available. (2) A user can retrieve information interactively by using word bases as a keyword. This system is, therefore, appropriate to apply to the information retrieval system for undisposed information stock such as a thesaurus. (3) Detailed guidelines are shown in Japanese, so that even a beginner can easily hundle the operation of the system.

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There are some students who are in trouble to make progress their laboratory work, when you teach in your class. It is really necessary for you to recognize the difference of each students' learning speed is caused by their abilites per se or their character, and you decide which student need to be helped. This report describes that the methods to recognize the cause in the system CAI which is composed of learning by Cards and Personal Computer.

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