The spacing effect

If the forgetting problem is the disease, the spacing effect is the cure. Discovered by Ebbinghaus himself and confirmed by over a century of research, the spacing effect shows that distributing practice over time produces dramatically better retention than massed practice.

The mechanism is counterintuitive. You learn better by reviewing material just as you're about to forget it. Each successful retrieval at the edge of forgetting strengthens the memory and extends the interval before the next review is needed. What starts as daily reviews becomes weekly, then monthly, then quarterly.

Repeatica implements this through a spaced repetition algorithm that schedules reviews at optimal intervals for each individual flashcard. You don't decide when to review — the system does, based on your performance history. The result is maximum retention with minimum time investment.