Most students measure revision in hours. The research says you should measure it in intervals — the gaps between the times you revisit a topic. Space those gaps well and the same total study time produces far more durable memory. Here are three techniques that put spacing to work, and how ASAI automates the scheduling so you don't have to keep a spreadsheet.

1. The two-day, then widening, schedule

After you first learn something, review it the next day, then two days later, then four, then a week, then two weeks. Each successful recall tells you the memory is stronger, so the next gap can be longer.

The trap is reviewing too soon. If you can recall a fact effortlessly, you reviewed too early and learned almost nothing from the repetition. A little bit of struggle is the signal that the review is doing work.

Difficulty during recall is not a bug. It's the mechanism. Easy reviews feel productive and change very little.

2. Interleave topics instead of blocking them

Blocking means finishing all of topic A before starting topic B. Interleaving means mixing them: a few questions on A, then B, then C, then back to A.

Interleaving feels harder and slower in the moment, and students consistently rate it as less effective — right before they outperform their blocked-practice peers on the test. Mixing topics forces your brain to first identify which method applies, which is exactly what an exam asks you to do.

  • Blocked practice trains you to execute a method you've already been handed.
  • Interleaved practice trains you to choose the method. That's the skill under assessment.

3. Review at the edge of forgetting

The ideal moment to review is just before you would have forgotten. Too early wastes the repetition; too late and you're relearning from scratch.

You can't feel that moment reliably on your own, which is where the algorithm earns its place. ASAI tracks how quickly your recall of each topic decays and surfaces it for review at the point where the repetition delivers the most benefit — usually a day or two before you'd expect.

Putting it together

You don't need all three at once. Start with widening intervals on your weakest three topics this week, add interleaving to your practice sets next week, and let the app handle the timing. The goal isn't to study more. It's to make each review count for more.