An economist Yukio Noguchi proposed the extrusion filing. He prepares many envelopes which can hold A4 papers without folding them. He writes an explanation of the contents on each envelope.

He puts the newly added envelope on the one end. He moves recently used envelopes to the one end. Eventually, envelopes you often use or recently gather at one end and envelopes you do not use often gather at the other end. If you compare it to a computer file, it corresponds to the sort in order of update time.

Extrusion filing was proposed in 1993. In this era, personal computers have not spread as much as now, and smartphones have not appeared. Twenty-five years later, many people carried smartphones, and they can access digital data at any time. In response to this situation, Toshiyuki Masui, a user interface researcher, proposed an organizing method based on the use of digital data in 2013. It is called "clear folder organization method."

In the clear folder organization method, he writes a number for identification on each clear folder. He puts the document in the clear folder, and record the correspondence between that number and contents as digital data. He does not sort the folders. The folders are always kept in numerical order. In this way, you can find out the number of what you want to find by searching in the data. Suppose the number is 38, you can find number 38 from among the clear folders that are in numerical order. By managing information where the object is as digital data, you can search in it. It is an augmentation of the ability to find things by information processing technology.

I carry pieces for a writing chapter only in the document case. I always carry around with them. I put the newly written pieces or paste them on A4 paper in a short fragmental time.