Pile of Indexcards

ref. : Implementation of revision rule

I just implemented revision rule on the PoI system. It's simple. If the card is useful, I put a mark (star) on right-top-edge of the card. If I use a card again, I give one more star. Then it is clear which card is useful even after returning all cards in the Dock. After giving a star, the used card is now safely return to the Dock.

In practice, I found that if I use red pen, I always have to take two pens, blue and red. I think the system always must be simple. So, I decide to use blue pen as usual for the star, too. The star should be small mark if I think putting 2 or more stars in future. See example below.