A joint post by Claire Badger and Andrew Cohen
Flashcards are one of the easiest ways for students to incorporate Retrieval Practice into their independent study. Flashcards don’t look especially impressive. They are cards with a question written on one side and the answer on the other. Or they could have a key term on one side and a definition or translation on the other.
Given that research suggests that 56% of students use flashcards at least sometimes as part of their preparation, it’s important that we understand how to design and use flashcards properly so that they build durable knowledge.
Read on to find out:
Why Retrieval Practice beats rereading
Seminal research by Roediger and Karpicke showed that students who practised retrieving information performed significantly better on later tests than those who spent the same amount of time rereading, even though the rereaders felt more confident at the time. Retrieval creates what psychologists call desirable difficulty: effortful, sometimes uncomfortable but far more effective.
Flashcards are a simple way to use retrieval practice. Research has shown that learners who repeatedly retrieve information using flashcards outperform those who simply restudy the same material, even when total study time is held constant.
Each prompt forces the learner to answer a question before seeing the answer. However, it’s important that students do actually retrieve the answers to their flashcards. Students should be explicitly warned against just answering questions in their heads, as they can easily trick themselves into thinking they got the answer right. Whereas research suggests that if students answer their flashcard questions out loud, it improves their learning.
Why Spacing matters more than repetition
Of course, retrieval alone isn’t enough. Timing matters. Practising retrieval back-to-back can feel successful, but it often produces fragile learning that fades quickly. This is where spaced repetition comes in.
Spacing learning over time has been one of the most robust findings in cognitive science for over a century. Research on flashcard use specifically shows that spacing reviews across time leads to significantly better long-term retention than cramming the same cards in a single session.
Why? Because when retrieval attempts are separated by increasing intervals, memory traces become more stable and resistant to forgetting. Each successful recall strengthens the underlying memory and makes future retrieval more likely.
Combining retrieval and spacing is known as successive relearning. When using flashcards, it’s tempting to remove flashcards once the correct answer has been retrieved; however, researchers have found that students who never revisited the flashcards they got right did significantly worse than students who revisited all their flashcards regularly, regardless of if they initially got them right or wrong.
Systematising Spacing
Spacing is powerful, but it’s also difficult to manage manually. Learners are notoriously bad at judging what they know, when they should review it, and how long to wait before revisiting material. In other words, left to their own devices, students tend to neglect what actually needs work and over-review easy material.
One solution to this problem is the Leitner System. This is a box method where flashcards that are answered incorrectly are reviewed more frequently than those answered correctly whilst ensuring that every flashcard is still revisited over time.
Another solution is an adaptive digital flashcard system like Anki, RemNote, or Brainscape. By tracking performance on individual cards, digital systems can automatically adjust review intervals, bringing weaker material back sooner and pushing stronger material further into the future. This makes spaced repetition practical and scalable.
From an educational perspective, this matters enormously. It means learners spend their limited study time where it has the highest impact, rather than where it feels most comfortable.
Flashcards support deeper learning (not just memorisation)
One common misconception is that flashcards are only useful for rote facts.
In reality, retrieval practice supports conceptual understanding when the prompts are designed well. Questions that ask learners to explain relationships, apply principles, compare ideas, or generate examples require far more than surface recall.
In fact, the act of retrieving an explanation, even imperfectly, helps integrate new knowledge into existing mental frameworks. This is why retrieval practice has been shown to improve transfer, not just retention.
Final thoughts
Flashcards work not because they are simple, but because they align beautifully with how memory actually functions.
They:
- Force active retrieval rather than passive exposure
- Create desirable difficulty that strengthens learning
- Pair naturally with spacing to support long-term retention
- Can be scaled effectively through digital systems that manage timing and feedback
In a world full of educational innovations, flashcards endure because they do something rare: they respect cognitive reality.
Not bad for something that fits in your pocket.
