The Problem with Traditional Vocabulary Study
Most learners approach new vocabulary the same way: write a list of words, study them the night before, pass the test, forget everything within a week. This is called massed practice — cramming information into a short period. While it produces short-term results, it fails to build long-term memory. There's a better way, and it's backed by decades of cognitive science: spaced repetition.
What Is Spaced Repetition?
Spaced repetition is a learning technique where you review information at increasing intervals over time. Instead of reviewing a word every day, you review it:
- After 1 day
- Then after 3 days
- Then after 1 week
- Then after 2 weeks
- Then after 1 month, and so on…
Each time you successfully recall a word, the interval before the next review gets longer. If you forget it, the interval resets to shorter. This mirrors how human memory actually works.
The Science Behind It: The Forgetting Curve
In the 1880s, psychologist Hermann Ebbinghaus mapped out what he called the Forgetting Curve — a graph showing how quickly memory fades without reinforcement. His research showed that we forget roughly half of new information within a day if we don't review it.
Spaced repetition directly combats this curve. Each review session at the right moment strengthens the neural pathway associated with that word, making recall easier and the memory longer-lasting. Over time, words move from short-term to long-term memory.
How to Use Spaced Repetition for English
Option 1: Digital Flashcard Apps
The easiest way to use spaced repetition is through apps that automate the scheduling for you:
- Anki — free, highly customisable, and used by language learners worldwide. You create your own card decks or download pre-made ones.
- Quizlet — beginner-friendly with a built-in spaced repetition learning mode.
- Duolingo — incorporates spaced repetition into its lesson structure.
For vocabulary cards, include the word, its definition, a sentence example, and ideally an image or audio recording to engage multiple senses.
Option 2: Physical Flashcard Box (Leitner System)
If you prefer pen and paper, the Leitner System uses a box with 5 dividers:
- Box 1 — Review daily. New or forgotten cards go here.
- Box 2 — Review every 2 days. Cards you got right move here.
- Box 3 — Review weekly.
- Box 4 — Review fortnightly.
- Box 5 — Review monthly. Cards here are well-known.
If you answer a card correctly, it moves to the next box. If you get it wrong, it goes back to Box 1.
What to Put on Your Flashcards
Avoid simply writing a word and its translation. That creates shallow, passive memory. Instead, create rich flashcards:
- Front: The word in a sentence with a blank. E.g., "She was known for her _______ (= impressive skill or talent)."
- Back: The word (prowess), pronunciation, part of speech, and a second example sentence.
This forces active recall — you have to retrieve the word, not just recognise it.
Building a Sustainable Habit
| Daily Time Investment | Cards Reviewed Per Day | Words Learned Per Month |
|---|---|---|
| 5 minutes | ~20 cards | ~100 new words |
| 10 minutes | ~40 cards | ~200 new words |
| 20 minutes | ~80 cards | ~400 new words |
Note: These are approximate figures. Actual results depend on card difficulty and individual memory.
Tips for Success
- Review at the same time each day — attach it to an existing habit (morning coffee, commute, etc.).
- Don't add too many new cards at once — 10–15 new words per day is manageable for most learners.
- Use the words in writing and speaking — spaced repetition builds recognition; production comes from practice.
- Be consistent — missing days causes reviews to pile up. Short daily sessions beat long weekly ones.
The Bottom Line
Spaced repetition is not a magic shortcut — you still have to put in the time. But by studying smarter rather than harder, you can build a vocabulary that sticks for life. Set up your system today, add 10 new words, and return tomorrow. That's how mastery begins.