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This paper presents an attempt to construct a feedback systenr PECOF which improves a Japauese-English Machine Translation system by feedback of correcting information given by posteditors. PECOF analyzes the error-correcting information by using an English-Japmmse Machine Translation system which works in the reverse direction to the original MT sys~ tern, corot)ares the intermediate expressions of the corrected patterns with those of the erroneous parts of the originai MT output at every transfer stage and idenLifies the responsible parts of the original Japanese-English M'P system. Then PECOF corrects the

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In technical documents, diagrams are generally utilized with expository text aiming at concise presentation of information.Since the information is conveyed by both text and diagrams, it is necessary to understand both of them to extract information from documents. In this paper, we propose a method of understanding of expository