While rebuilding an application system, it will reduce the cost to reuse the old system's information. In this paper, we propose a specification extraction method from a business application which updates file records. The method uses program slicing technique and extracts information in CUD (Check Update Description) style. Using the results of backward slicing from file output statements, record update processes and their executing condition are able to be extracted. The method was applied to a project which was rebuilding a business applications, and was evaluated that the extracted CUD contained useful information.
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