Aoe Laboratory at Tokoshima University has developed a software for automatic classification of textual documents in all folders. The software was still in development in July 1998, but was about to be released commercially. It can classify documents in a personal computer or on the Internet, can be used for documents in Japanese or in English, and returns a sentence that explains the content of each document class after classification.
The system uses keyword retrieval in texts (see 
) and the
associated concept hierarchy to classify texts according to their
content.