Spaced Repetition for Vocabulary in the Classroom

You teach ten new words on Monday, and by Thursday half the class looks at you blankly. That is not laziness; it is how memory works. This guide shows you how to use spaced repetition for vocabulary in the classroom: why new words fade so quickly, a review schedule you can actually keep, low-prep five-minute routines, and a simple way to track what your students still remember.

Why do students forget new words within days?

A newly learned word fades fastest in the first few days. That is the forgetting curve: recall falls steeply right after learning, then the decline slows down. If the word is never met again, most of it is gone within a week.

The useful part is what happens when students retrieve a word just as it is starting to fade. Each successful recall makes the next round of forgetting slower, so the word lasts longer before it needs another review. Spaced repetition is built on that idea: review often at first, then less and less often.

Three classroom habits work against it:

• Cramming at the end of the unit. One big review lesson feels great on the day and is forgotten two weeks later.
• Recognition only. Students recognise a word on a list but cannot produce it. Recognising is not the same as remembering.
• No plan for review. New material keeps arriving, and old words simply never come back.

Spaced repetition for vocabulary in the classroom: a simple schedule

You do not need an algorithm. For a teacher who sees a class three or four times a week, this schedule is a solid starting point:

Review	When	Time
1st review	Next lesson	3–5 minutes
2nd review	About a week later	3–5 minutes
3rd review	Two to three weeks later	5 minutes
4th review	About a month later, in a revision lesson	5–10 minutes

The rule is simple: a word the class struggles with goes back to the start of the schedule, and a word they recall easily moves on to the next, longer gap. Your review time goes to the words that are actually slipping, not the ones everyone already knows.

A practical tip: label every new set of words with the date you taught it ("12 October, Unit 3, 10 words"). Count the review dates forward from there and write them into your planner. A single line in a lesson plan, such as "review: 5 October set", is often all it takes to stop review from being forgotten too.

Low-prep review routines (five minutes or less)

Spaced repetition only survives if it is cheap to run. None of these routines needs photocopies or planning time, and all of them work as a lesson warm-up.

1. Recall and write (3 minutes)

Put picture clues or short definitions on the board. Students write the English word in their notebooks, then check with a partner. The point is to pull the word out of memory, not just to recognise it.

For weaker students: give the first letter ("b_______" for borrow). For stronger students: add a sentence for each word.

2. Missing letters (3 minutes)

Write words with gaps on the board, such as "env_r_nm_nt" or "pol_t_". Students complete them and say what they mean. It reviews spelling and meaning together and takes thirty seconds to prepare.

3. Three sentences, one minute (5 minutes)

Pick three words from last week's set. In pairs, students write one sentence for each word about their own lives: "I borrowed a pencil from my friend yesterday." Ask a few pairs to read theirs aloud. Personal sentences tie a word to a memory.

4. Exit ticket (2 minutes)

At the end of the lesson, students write three words they remember from today's review set on a slip of paper and hand it to you on the way out. A one-minute look through the slips tells you which words need to go back to the start of the schedule.

5. The class word box

Keep a box or envelope with one word per card. At the start of a lesson, pull five cards at random and ask the class. Cards that come back instantly go into the "easy" section; cards that cause hesitation go into "again". The "again" cards come out next lesson; the "easy" section is opened less often. This is a whole-class Leitner box, and it runs spaced repetition almost by itself.

How to track vocabulary review

Tracking is where spaced repetition usually breaks down. Keep it simple:

• A word-set chart. In a notebook or spreadsheet, give each word set a row and add columns for the 1st, 2nd, 3rd and 4th review. Write the date in the box when you do the review. An empty box is a review that is due.
• A red dot. During a review, put a red dot next to any word most of the class got stuck on. Red-dot words always come back in the next review.
• Student self-rating. Students mark each word on their own list as "know it / not sure / don't know". Both you and they can see what needs another look.
• Make quizzes part of the schedule. In a five-word quiz, take at least two words from older sets. The quiz then does double duty as a review.

With a big class you cannot follow every student individually. The goal is a clear picture of the class and a short list of the words that are fading fastest.

Spaced repetition at home

Classroom review cannot carry the whole load when you only see a class for a few hours a week. A daily habit of a few minutes at home helps a lot. A simple version: students make word cards with the English word on the front and the meaning plus an example sentence on the back. Each evening they go through the deck; cards they miss go to the front, cards they know go to the back.

A digital tool can take over the scheduling. In Owlio, every word is scheduled separately for each student with SM-2-based spaced repetition: a word the student recalls comes back after longer and longer gaps, and a word they miss comes back soon. Once at least ten words are due, the student can do a short Daily Review of 10 to 25 words, rating each one Hard, Good or Easy. Words that reach long review intervals count as mastered and leave the daily review.

A checklist for your first week

If you want to start tomorrow:

1. Write this week's new words down as one dated set.
2. Add a five-minute review to the start of your next few lessons.
3. Pick two of the routines above and alternate them.
4. Start your word-set chart and record each review date.
5. In two weeks, give a short quiz on older sets and mark the red-dot words.

Spaced repetition is not an extra lesson or a big project. Giving the first five minutes of each lesson to older words noticeably cuts down the "we never learned that" moments at the end of a unit.