The Forgetting Curve
Ebbinghaus showed that new memories decay fast at first, then slower — and each well-timed review flattens the slide. Forgetting is learning's schedule.
In the 1880s Hermann Ebbinghaus memorized invented syllables and tested his recall over days and weeks. The curve drops steeply just after learning, then levels off: most of what is lost is lost early.
He also found the remedy. Each relearning restarts the curve higher and makes it fall more gently. Reviews spaced at growing intervals beat the same ones bunched together.
This is the spacing effect; spaced-repetition software is engineering built on it.
Ride the curve, don't fight it
Review soon after first contact
Revisit new material within about a day, while the steep part of the curve is working against you hardest. A short early review saves hours of relearning later.
Stretch each interval
Space the next reviews at growing gaps — a few days, a week, a month. If recall takes a little effort at review time, the timing is right; effortless review came too soon.
Let a system keep the calendar
Use a spaced-repetition app or a simple card-box rotation so the schedule, not your mood, decides what gets reviewed today. Memory management is too important to leave to memory.
- Due today beats interesting today
- Trust the schedule on busy days
You never beat forgetting head-on. You time your returns so it never wins.
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