Spaced Repetition: The Science-Backed Study Method That Actually Works
Spaced repetition is the most effective study technique known to science. Learn how ReviseAI's built-in spaced repetition system helps you remember everything.
What is Spaced Repetition?
Spaced repetition is a study technique where you review information at increasing intervals over time. Instead of cramming everything the night before an exam, you review material multiple times — but with longer and longer gaps between each review.
The science behind it is well-established: the forgetting curve (discovered by Hermann Ebbinghaus in 1885) shows that we forget information exponentially unless we actively review it. Spaced repetition works by reviewing material just before you're about to forget it, which strengthens the memory and pushes the forgetting curve further into the future.
The SM-2 Algorithm
Most spaced repetition apps — including Revise AI — use a variant of the SM-2 algorithm, developed by Piotr Wozniak in 1987. The algorithm calculates when you should next review each flashcard based on:
- How well you knew it (your self-rating: Again / Hard / Good / Easy)
- Your ease factor (how easily you remember this particular card)
- Your review history (how many times you've reviewed it before)
Cards you find difficult are reviewed more frequently. Cards you know well are spaced out to weeks or months apart. This means you spend your revision time exactly where it's needed most.
How Revise AI Implements Spaced Repetition
When you review flashcards in Revise AI, you rate each card after revealing the answer:
| Rating | Meaning | Next Review |
|---|---|---|
| **Again** | Didn't know it | ~10 minutes |
| **Hard** | Struggled | ~1 hour |
| **Good** | Knew it with effort | 1-3 days |
| **Easy** | Knew it instantly | 4-7+ days |
Over time, Revise AI builds a personalised schedule for each card. Your home screen shows how many cards are due for review today — typically 10-30 cards for an active user, taking about 10-15 minutes.
Why Spaced Repetition Beats Cramming
Research consistently shows that spaced repetition produces dramatically better long-term retention than massed practice (cramming):
- A 2006 study by Cepeda et al. found that spaced practice produced 200% better retention than massed practice at a 1-month delay
- Students using spaced repetition typically retain 80-90% of material after 6 months, compared to 10-20% for cramming
- The benefits are largest for factual knowledge — exactly what GCSE and A-Level exams test
Getting Started with Spaced Repetition on Revise AI
- Generate flashcards for one topic (paste your notes, click Generate)
- Review today — work through all new cards, rating each one honestly
- Come back tomorrow — Revise AI will show you the cards that are due
- Review daily — even 10 minutes per day compounds dramatically over weeks
The key is consistency. Spaced repetition doesn't work if you skip days — the whole point is the spacing. But if you review for just 10-15 minutes every day, you'll be amazed how much you retain by exam time.
Start Your Spaced Repetition Journey
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