Pile of Indexcards

ref. : Strict chronological order

The revision rule of Noguchi filing system sounds quite useful to keep system "alive". I think there is another way to implement it into the PoI system.

For example, when you pick up an indexcard from the dock, mark the top edge with a color pen, say red, then return to it's original position the dock. The order is unchanged. When you use the indexcard again, you put one more mark. Like a star for soldiers. Consequently, there are many mark for indexcard that you use frequently. Then you'll clearly see which card you used before.