Noguchi Yukio 野口悠紀雄 argues that for the individual researcher, classification is an endless and fruitless task (1993, 1995, 1999, 2000), and proposes that library-type classification by subject be discarded in favor of chronological ordering (that is, ordering on the basis of what document has last been used). His method basically involves putting all material into A4 envelopes and placing the most recently used envelope at the end of the row.