Active recall
for vocabulary

What active recall is

Two things can happen when a word comes back. You can recognise it: you see meticulous among four options and know it is the right one. Or you can recall it: you see “very careful about every detail” and the word itself comes to mind. Recall is harder, and the effort is what makes it work. Rereading a list, or flipping a card before you have tried, is neither: it only feels like practice.

Researchers call it retrieval practice, and the gain from it the testing effect. It is the reason a flashcard works better when you answer before you turn it.

What the research shows

In one study, students read short science passages. Some then read the passage again; others wrote down what they remembered, with no feedback. Five minutes later the rereaders did better (81% against 75%). Two days later the tested students were ahead, and after a week they remembered 56% against 42%. In a second experiment, students who read a passage once and recalled it three times remembered 61% a week later; those who read it four times remembered 40%, and were the most confident they would remember it (Roediger and Karpicke, Psychological Science 17(3), 2006).

A second study used vocabulary: 40 Swahili–English word pairs. Once a student could recall a pair, it was either kept in the tests or dropped from them. A week later, students who kept being tested recalled about 80% of the pairs; when recalled pairs were dropped from testing, they recalled 33% to 36%, even if they kept studying them. Studying a pair again after it was learned added nothing. Students in every group predicted they would remember about half (Karpicke and Roediger, Science 319, 2008).

These are not isolated results. A meta-analysis of 159 comparisons found testing beat restudying on average, with larger gains from recall tests than from recognition tests (Rowland, Psychological Bulletin 140(6), 2014), and a review of ten common study techniques rated practice testing one of only two with high utility (Dunlosky and colleagues, 2013). Effort matters too: in one study, recalls that were harder but still successful did more for memory than easy ones (Pyc and Rawson, Journal of Memory and Language 60, 2009). That is why a gap that lets a word fade a little before it comes back helps.

Test both directions

A word card can ask in two directions. Word to meaning (receptive) is what reading and listening need. Meaning to word (productive) is what speaking and writing need, and it is harder. In a study of Japanese learners of English, word pairs learned productively gave larger gains in more kinds of knowledge (spelling, productive meaning, how the word fits a sentence), while receptive learning won only on receptive meaning (Webb, RELC Journal 40(3), 2009).

• Start receptive. A word you have just met is easier to recognise than to produce; a few right answers build confidence.
• Add productive once the word is familiar. See the meaning, say or type the word.
• Keep the sentence on both sides. A gap in one of the word’s own examples asks for it in context, which is how you will need it.

Typing or choosing

Choosing from options is recognition: quick, and good for a word’s first days. Typing or saying the word is recall, and it tests what choosing cannot: the spelling, the gender or article, the exact form.

• Choose while a word is new; type once you know it.
• Type the words you misspell, and the words where one letter makes another word.
• Say it out loud when you cannot type: on a walk, a whispered answer is still recall.
• Grade honestly. “Almost” on a self-graded card is a miss. A miss brings the word back sooner, which is what it needs.

Mistakes that waste reviews

• Turning the card too soon. Give yourself a few seconds of real effort before you look.
• Dropping a word once you get it right. The 2008 study is about exactly this: recalled words kept in the tests were remembered more than twice as well. Keep testing, at longer gaps.
• Testing only one direction. Knowing meticulous when you see it is not the same as finding it when you need it.
• Cramming the tests into one evening. Recall works best spread out: a day, a few days, a week, three weeks. Spaced repetition explains the gaps.
• Testing words out of context only. A gap in a sentence you met tells you more than the word alone.

The wider method, with spacing and context: How to memorize vocabulary.

How Lexpad applies it

Lexpad, our own app, is built around recall: every card asks before it shows, and the order follows the research above. New words start with recognition, the gap in an example joins after the first answer, and the productive cards come from box 2.

Sources, read 25 October 2026

• Roediger, H. L. and Karpicke, J. D. (2006). Test-enhanced learning: taking memory tests improves long-term retention. Psychological Science 17(3), 249–255.
• Karpicke, J. D. and Roediger, H. L. (2008). The critical importance of retrieval for learning. Science 319, 966–968.
• Rowland, C. A. (2014). The effect of testing versus restudy on retention: a meta-analytic review of the testing effect. Psychological Bulletin 140(6), 1432–1463.
• Pyc, M. A. and Rawson, K. A. (2009). Testing the retrieval effort hypothesis. Journal of Memory and Language 60, 437–447.
• Webb, S. (2009). The effects of receptive and productive learning of word pairs on vocabulary knowledge. RELC Journal 40(3), 360–376.
• Dunlosky, J. and colleagues (2013). Improving students’ learning with effective learning techniques. Psychological Science in the Public Interest 14(1), 4–58.