A thousand words a year sounds impressive, but in reality, it’s just three new words a day.
Anyone who has ever studied a foreign language knows how difficult it can be to effectively expand one’s vocabulary. Research shows that even an educated person—someone with a rich vocabulary and the ability to use complex linguistic structures in his or her native language—often feels significant discomfort when communicating in a foreign language. They are forced to rely on simple words and basic structures to express complex ideas and abstract concepts. If that person happens to be learning and using several different languages simultaneously, the challenge multiplies. Naturally, I encountered this problem myself.
When I first started learning foreign languages, I used a notebook and pen, just like everyone else. Later, I decided to refine and improve my study tools. These tools proved invaluable in helping me expand my vocabulary and learn multiple languages. I began to explore the scientific foundations of learning and memory, which led me to adopt the method of "spaced repetition."
Learning three words a day is easy; many people have tried this approach. The problem is that by the end of the month, almost all the words that haven’t been put into practice are forgotten. Therefore, the real challenge isn’t just how to build your vocabulary, but how to retain what you’ve already learned.
Note: I am the developer of WeaveWords, an app for vocabulary learning, which is mentioned later alongside other tools. The method described here works with any of these tools, as well as with traditional paper flashcards.
Stage 1. Review according to a schedule, not your mood
We tend to forget newly learned information quickly, especially during the first few days. Over time, however, the rate of forgetting slows down. Spaced repetition takes advantage of this pattern: reviewing a word just before you're likely to forget it helps strengthen your memory and makes the next review necessary only after a longer interval. Reviewing a word just as you are about to forget it "resets the timer" and extends the interval until the next review. This method is known as "spaced repetition."
When done correctly—meaning you can successfully recall the word each time—the review schedule looks like this:
1 day → 6 days → 15 days → 38 days → approximately 3 months
Five reviews are enough to firmly anchor a word in your memory for many months. If you skip a session, the count resets—everything starts over from day one. You can see how these intervals shift based on the complexity of the material by using a free calculator I created while developing my app.
Stage 2. A 15-minute daily plan
Spend the first 10 minutes on review. Work through all the words scheduled for today before moving on to new ones. This is the stage that transfers information into long-term memory.
Dedicate the remaining 5 minutes to new vocabulary words. Add 3–5 words—ideally, ones you encountered in the materials you read or watched that day.
Link your study sessions to an existing habit—for example, your morning coffee, your commute to work, or the time right after lunch. Let it become a natural addition to something you already do regularly.
Why 3–5 words instead of 20? Each new word requires approximately five reviews. If you learn 20 words a day, within just a few weeks the number of necessary reviews will reach into the hundreds—and this is precisely the point at which most people give up due to a lack of time.
Stage 3. Create flashcards that will be useful in the future
A flashcard that simply says "tener — to have" is practically useless. An effective vocabulary flashcard should include:
- A single word or a short phrase on the front—avoid listing five different meanings.
- The sentence in which you encountered the word, along with an image related to its meaning. Context helps you move from mere recognition to the active recall of a word.
- An audio recording. Without hearing how a word sounds, you won’t be able to recognize it in actual conversation.
- The specific form of the word that you are most likely to use in practice. For example, when learning the verb "go," it is more useful to create a flashcard with the form "went."
Creating flashcards takes time—especially if you are manually adding example sentences, translations, and audio. This is the very problem I set out to solve when I began developing WeaveWords.
Today, there are apps that can automatically add translations, example sentences, and audio recordings. Choose the method that works best for you and helps you overcome these kinds of challenges.
Step 4: Prepare for "off" days
Inevitably, there will be times when you have to skip a study session. To stay on track and prevent a backlog of hundreds of cards waiting for review, follow these rules:
- If you miss a day, review your existing cards, but do not add any new ones.
- If you miss a week, review 50 cards per day until you’ve caught up; again, refrain from adding new words during this time.
- If you feel your motivation slipping, reduce the number of new words to just one per day for a full week. Maintaining the habit is more important than the speed of learning.
Which learning tool should you choose?
Anki — a free, highly customizable application for desktop and Android; you create the flashcards yourself. An excellent choice for those who like to tailor everything to their own preferences.
Quizlet — offers pre-made flashcard sets and learning games; its review scheduling system is more flexible than traditional spaced-repetition methods.
WeaveWords (my project) — you enter a word, and the app automatically adds a translation, an example sentence, and an audio recording. It uses the SM-2 algorithm for scheduling reviews. The service is available for free online and on Android; it also supports importing decks from Anki, Quizlet, and ReWord.
The specific tool is secondary; what truly matters is consistency. If you dedicate fifteen minutes a day to reviewing material you’ve already learned—before moving on to new content—you can master a thousand new words in a year. Interested in the scientific basis for the spaced repetition method? You can find a detailed analysis of this topic here.
