You read the chapter. You understood the chapter. Three days later, the chapter has quietly packed its bags and left. If that sounds familiar, Koa has good news: it is not you, it is how memory works. And there is a simple, well-tested trick that helps: spacing your reviews out over time.
The forgetting curve: a 140-year-old experiment
In 1885 the German psychologist Hermann Ebbinghaus published Über das Gedächtnis ("On Memory"). He spent long stretches memorising lists of nonsense syllables, then tested himself after different delays. The result became famous as the forgetting curve: we lose a big part of new material quickly at first, and then the forgetting slows down.
He also noticed something more hopeful. Material that was reviewed again later, spread out over days, stuck much better than material crammed in one go. Today this is called the spacing effect.
Does it hold up today?
Very much so. A large review by Cepeda and colleagues in 2006 looked at decades of research on distributed practice. Across the comparisons they analysed, spaced study beat massed study (cramming) in 259 out of 271 cases.
In 2013, a team led by John Dunlosky reviewed ten popular study techniques for the journal Psychological Science in the Public Interest. Only two got their top "high utility" rating: practice testing and distributed practice. Rereading and highlighting, the favourites of many of us, landed in the low-utility group.
So the two winners fit together perfectly: test yourself, and do it again a few days later.
A Finnish-calm way to try it this week
You don't need an app or a complicated system. Koa's gentle version:
- Day 1: Learn the topic. At the end, close the book and write down what you remember on a blank page.
- Day 2: One short focus round: quiz yourself before you look at your notes. Mark what you missed.
- Day 5: Another quick quiz, only on the shaky parts.
- Day 10: A final check. If it still sits, give it a longer gap next time.
Each review can be tiny. One 25-minute block on the free study timer is usually plenty, and the breaks in between are part of the plan, not a reward you have to earn.
Flashcards, but make them smart: the Leitner boxes
In 1972 the German science journalist Sebastian Leitner described a clever paper system in his book So lernt man lernen. Cards you answer correctly move to the next box and come back less often. Cards you miss go back to box one and come back soon. That way your time goes to the things you actually don't know yet.
A simple three-box version: box 1 every day, box 2 every three days, box 3 every five days. Koa uses a shoebox and three pink dividers. (If you'd rather print than cut, the Koa Flashcards Kit has cut lines in three sizes.)
Three small rules that make spacing work
- Quiz first, reread second. Trying to recall is the workout; rereading is the stretch afterwards.
- Feeling "rusty" is the point. A little struggle when you review means the gap was long enough to help.
- Start earlier, not longer. Four short sessions over ten days beat one long night before the exam.
Shade of the day: no. 17, Taffy
Today's pink is Taffy, #FA86C4: a sweet candy pink with a bit of energy. It pairs beautifully with gold, sage and navy. Koa suggests it for the "review again" tabs in your notebook, so future-you knows exactly where to look.
Koa's launch month is still running: code KOA20 takes 20% off until 25 October.
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