A paper SRS accomplishes the same feat using a flash card file box, a carefully designed schedule, and a few simple instructions. It’s basically a simple board game. The game contains seven levels, which correspond to seven labeled sections in your file box (i.e., level 1, level 2, etc.). Every card starts on level 1, and advances to the next level whenever you remember it. If you forget, the card falls all the way back to level 1. Whenever a card gets past level 7, it has won its place in your long-term memory.
