How do you memorize 2,000 kanji without going crazy? The answer lies in science: spaced repetition (Spaced Repetition System - SRS) is the most effective method for long-term memorization.
What is Spaced Repetition?
Spaced repetition is a learning technique that involves reviewing information at increasing intervals over time. Instead of studying everything daily, you review each item just when you're about to forget it.
The Science: The Forgetting Curve
In 1885, psychologist Hermann Ebbinghaus discovered the "forgetting curve": without review, we forget 70% of information within 24 hours. But each time we review, the curve flattens and memory becomes more durable.
How It Works in Practice
- Day 1: Learn a new kanji
- Day 2: First review (1-day interval)
- Day 4: Second review (2-day interval)
- Day 8: Third review (4-day interval)
- Day 16: Fourth review (8-day interval)
- And so on, with ever-increasing intervals
Why SRS is Perfect for Kanji
Kanji are perfect for SRS because they're discrete units of information: each kanji has meaning, readings and associated words. SRS lets you focus on the kanji you struggle with most, optimizing study time.
Benefits of Spaced Repetition
- Long-term memorization (not just for the exam)
- Efficient study: less time, more results
- Personalized: focus on your weak points
- Burnout prevention: short but effective sessions
- Measurable progress tracking
The SM-2 Algorithm
The most widely used algorithm for SRS is SM-2, developed by Piotr Wozniak. It calculates the optimal interval based on your performance: if you answer correctly, the interval increases; if you make a mistake, you return to shorter intervals.
How to Get Started with SRS
- Choose an app that uses SRS (like Kanjidon)
- Start with few kanji per day (5-10)
- Study every day, even just 10-15 minutes
- Don't skip reviews: they're essential
- Be honest when evaluating your answers
Typical Results
With SRS applied correctly, you can expect to memorize the 100 JLPT N5 kanji in 2-3 months with only 15-20 minutes of daily study. The key is consistency, not intensity.
