You probably think you know how flashcards work. A question on one side, an answer on the other. Flip, check, repeat. But here is the uncomfortable truth: that standard format is leaving retention on the table. There is a better card type hiding in plain sight, and most students either ignore it or use it wrong.
Cloze deletion flashcards are fill-in-the-blank cards that hide a key word or phrase inside a full sentence, forcing your brain to retrieve the missing piece from context. They look simple. They are anything but. Research shows that when you pair cloze deletions with progressive hints (a technique called diminishing-cues retrieval practice), retention jumps by 44% compared to standard testing. No other flashcard app offers this. Except Notesmakr.
This post breaks down why cloze deletions work, the science behind progressive hints, and how to create cloze cards that actually stick. If you have ever forgotten something you "definitely knew," keep reading.
What Are Cloze Deletion Flashcards?
A cloze deletion is a sentence with one or more words replaced by a blank. The term comes from "closure" in Gestalt psychology: your brain naturally wants to fill gaps in patterns. A cloze flashcard exploits that instinct.
Here is an example. Take the fact: "The mitochondria is the powerhouse of the cell."
A standard flashcard would ask: "What is the powerhouse of the cell?" and expect the answer "mitochondria."
A cloze deletion card shows: "The [...] is the powerhouse of the cell." You must produce "mitochondria" from the surrounding context.
The difference is subtle but powerful. With the standard card, you are answering a detached question. With the cloze card, you are retrieving a word embedded in its natural context. Your brain processes the surrounding sentence, activates related concepts, and pulls the missing piece from a richer web of associations.
Cloze deletion flashcards hide a key term inside its original sentence context. Your brain must retrieve the missing word from surrounding meaning, not from an isolated question-answer pair.
The Science: Why Fill-in-the-Blank Works
Cloze deletions are not just a formatting trick. They activate three well-documented memory mechanisms simultaneously.
The Generation Effect
When you produce information yourself rather than simply reading it, you remember it better. Slamecka and Graf (1978) demonstrated this across five experiments: self-generated words were consistently recalled better than passively read words, regardless of encoding rules, timing, or test format.
Cloze cards force generation. You cannot passively recognise the answer. You must produce it from memory. Every time you fill that blank, you are strengthening the neural pathway.
The Testing Effect
Roediger and Karpicke (2006) showed that actively retrieving information from memory is more effective than restudying. Students who took practice tests remembered substantially more after one week than students who simply reread the material, even though the restudiers felt more confident.
Every cloze card is a mini-test. You see the sentence, your brain searches for the missing word, and that search process (whether you get it right or wrong) strengthens the memory trace.
Contextual Encoding
Research on vocabulary retention shows that learners who study words embedded in sentence contexts retain those words at significantly higher rates after three weeks compared to learners who study isolated word-translation pairs. The sentence context provides additional retrieval cues that strengthen the memory trace.
Cloze cards preserve context by design. The surrounding sentence is not decoration. It is a web of retrieval cues.
Cloze deletions activate three memory mechanisms at once: the generation effect (producing answers), the testing effect (retrieving from memory), and contextual encoding (surrounding cues strengthen recall).
Cloze Deletion vs Standard Flashcards vs Multiple Choice
Not all card types are equal. Here is how they compare on the dimensions that matter for long-term retention.
| Feature | Standard Q&A | Multiple Choice | Cloze Deletion |
|---|---|---|---|
| Requires active production | Yes | No (recognition only) | Yes |
| Preserves source context | No | No | Yes |
| Difficulty level | Variable | Low (can guess) | Moderate (context helps) |
| Risk of shallow recall | Medium | High | Low |
| Speed to create | Slow | Very slow | Fast |
| Best for | Conceptual understanding | Quick self-checks | Vocabulary, facts, definitions |
The key weakness of multiple choice is that it tests recognition, not recall. You see the correct answer among distractors and your brain says "that one looks right." But on exam day, nobody gives you four options. You must produce the answer cold.
Cloze cards sit in the sweet spot: they require production (like standard Q&A) while providing contextual scaffolding (which pure Q&A lacks). The surrounding sentence gives your brain just enough to work with without giving away the answer.
Try this now: Take any fact you studied recently. Write it as a full sentence. Now blank out the key term and try to recall it. Notice how the surrounding words help you retrieve the answer. That is contextual encoding at work.
The Problem with Basic Cloze Cards (And the Fix)
Here is where most cloze card users go wrong. They create cards like this:
"The [...] is the powerhouse of the cell."
After three reviews, you have memorised the pattern. The surrounding words become a trigger, and you recall "mitochondria" automatically without actually understanding the concept. Researchers call this pattern matching: you are recognising a familiar sentence shape, not genuinely retrieving knowledge.
Andy Matuschak, a researcher who has written extensively about spaced repetition, notes that cloze deletion prompts created by simply copying text and blanking phrases tend to produce shallower understanding than carefully crafted question-answer pairs. The prompts are easy to write but can encourage surface-level recall.
The fix: progressive difficulty.
What if the card started with most letters visible, then gradually removed hints as you got better? That is exactly what Diminishing-Cues Retrieval Practice (DCRP) does.
Diminishing-Cues Retrieval Practice: The 44% Advantage
In 2017, Joshua Fiechter and Aaron Benjamin published a study in the Psychonomic Bulletin & Review that changed how we think about scaffolded testing. Their technique, called diminishing-cues retrieval practice (DCRP), works like this:
- First exposure: most of the answer is visible (e.g., "mit_ch_ndr_a")
- Next review: fewer letters are shown (e.g., "m___c__n____")
- Later reviews: the blank is nearly complete (e.g., "____________")
The results were striking. Under conditions where standard retrieval practice was not helpful (when initial learning was poor), DCRP enhanced memory performance substantially. Under conditions that already favoured a strong testing effect, DCRP matched standard retrieval practice.
In other words: DCRP works when regular testing fails. It widens the range of conditions under which active recall improves memory.
Diminishing-Cues Retrieval Practice (DCRP) progressively removes letter hints from cloze cards as your learning improves. Fiechter and Benjamin (2017) found this technique enhanced memory even when standard testing produced no benefit, widening the effective range of retrieval practice.
Why DCRP Works: Desirable Difficulty
Robert Bjork's (1994) theory of desirable difficulties explains the mechanism. Learning conditions that feel challenging in the moment (slower, harder, more frustrating) produce stronger long-term retention than conditions that feel easy.
Standard cloze cards start hard and stay hard. If you do not know the answer, you just fail. There is no scaffolding.
DCRP starts easy and gradually increases difficulty. This keeps you in the optimal challenge zone: hard enough to strengthen the memory, not so hard that you fail repeatedly and learn nothing.
How to Create Effective Cloze Deletion Flashcards
Not all cloze cards are created equal. Follow these rules to get the most from them.
Do not paste entire paragraphs and start blanking words. Keep the front of your card to one or two sentences maximum. You should not take more than a few seconds to read the context before attempting the blank.
Resist the urge to blank multiple words in the same sentence. If "The mitochondria is the powerhouse of the cell" has three concepts worth testing, create three separate cloze cards. Each card should test one piece of knowledge.
The blanked word should be the most important piece of information: a name, a number, a technical term, a process. Never blank connecting words like "the" or "is." If the blanked word is not worth remembering on its own, the card is not worth reviewing.
Never create cloze cards from text you do not fully understand. If you are not sure what the sentence means or how the concept works, look it up first. Cards built from confusion reinforce confusion.
The best cloze cards come from sentences you have written yourself or encountered naturally. Copying textbook sentences verbatim produces cards that test pattern recognition, not understanding. Rephrase first, then blank.
Try this now: Open your most recent study notes. Find three key facts. Rewrite each as a single sentence in your own words. Blank the key term in each. You just created three high-quality cloze cards in under two minutes.
Watch: Active Recall and Flashcards in Action
Sometimes seeing the technique in practice is more powerful than reading about it. These two videos explain why active recall (the core mechanism behind cloze deletions) is the most effective study method available.
The Active Recall Framework (Ali Abdaal)
Ali Abdaal explains how active recall helped his friend rank 1st at medical school
Ali Abdaal walks through how his friend used active recall to rank first at medical school. Key insight: testing yourself is not just assessment. It is the learning itself.
Evidence-Based Revision Tips (Ali Abdaal)
Ali Abdaal covers the evidence behind effective study techniques
This video covers the research behind evidence-based revision strategies, including why active retrieval outperforms passive review in every controlled study. Key insight: the techniques that feel hardest produce the strongest memories.
Quick Reference: When to Use Cloze Deletion Cards
| Situation | Best Card Type | Why |
|---|---|---|
| Memorising vocabulary | Cloze deletion | Context preserves word meaning |
| Learning definitions | Cloze deletion | Key term embedded in its definition |
| Memorising dates and names | Cloze deletion | Sentence provides retrieval cues |
| Understanding a concept | Standard Q&A | Requires deeper explanation |
| Reviewing a process | Standard Q&A with steps | Multi-part answers need space |
| Quick self-check | Multiple choice | Fast but shallow |
Rule of thumb: if the answer is a single word or short phrase that fits naturally into a sentence, cloze deletion is your best option. If the answer requires a paragraph-length explanation, use standard Q&A.
How Notesmakr Makes Cloze Flashcards Better
Most flashcard apps treat cloze deletions as a formatting feature. Notesmakr treats them as a learning science feature. Here is the difference.
Notesmakr is the only flashcard app that implements Diminishing-Cues Retrieval Practice (DCRP) on cloze cards. When you create a cloze card in Notesmakr, the app does not just show a blank. It progressively reveals and then removes letter hints based on your learning progress:
- First reviews: syllable-aware hints show partial letters, giving you a foothold
- Improving reviews: hints diminish as your recall strengthens
- Mastered reviews: full blank, no hints. You produce the answer cold.
This is not a gimmick. It is the Fiechter and Benjamin (2017) research, implemented in software. No other flashcard app (including Anki, Quizlet, or RemNote) offers progressive letter hints based on learning progress.
And the best part? Cloze cards with DCRP are completely free in Notesmakr. No subscription required. You also get:
- Smart Reveal with syllable-aware and contextual hints
- SM-2 spaced repetition scheduling built in
- Anki .apkg import so you can bring your existing cloze decks
- CSV/TXT import for bulk flashcard creation
If you want to go further, Notesmakr's Scholar+ plan adds AI-powered flashcard generation from your notes and PDFs using the PDF to flashcards tool, plus an AI quiz maker for multiple-choice practice.
Already have Anki cloze decks? Import your .apkg files directly into Notesmakr and get DCRP progressive hints on your existing cards. No re-creation needed.
Common Mistakes with Cloze Deletion Cards
Mistake 1: Blanking too much text
If your blank covers half the sentence, you have not created a cloze card. You have created a guessing game. Blank one key term per card.
The fix: If the blanked section is longer than 3-4 words, split it into multiple cards.
Mistake 2: Copy-pasting textbook sentences
Directly copying and blanking produces pattern-matching, not understanding. Your brain memorises the shape of the sentence without processing the meaning.
The fix: Rephrase the fact in your own words before creating the card.
Mistake 3: Not combining with spaced repetition
Cloze cards without spaced repetition are just flashcards with extra steps. The real power comes from reviewing at optimally spaced intervals, which fights the forgetting curve by timing reviews just before you would forget.
The fix: Use an app with built-in SRS scheduling (like Notesmakr or Anki) rather than reviewing cards randomly.
Mistake 4: Creating cards you do not understand
If you blank a term you cannot explain without looking at the answer, the card is premature. You are memorising a word without learning the concept.
The fix: Use the Feynman Technique. Explain the concept in simple language first. Then create the card.
The Research Behind Cloze Deletions
Cloze deletion flashcards are not a study hack. They are grounded in decades of cognitive science:
Generation Effect (Slamecka & Graf, 1978): Information you produce yourself is remembered better than information you passively read. Cloze cards force generation on every review.
Testing Effect (Roediger & Karpicke, 2006): Retrieving information strengthens memory more than restudying. After one week, tested students retained substantially more than restudiers.
Diminishing-Cues Retrieval Practice (Fiechter & Benjamin, 2017): Progressive hint removal enhanced memory even when standard testing failed. The technique widened the effective range of retrieval practice.
Desirable Difficulties (Bjork, 1994): Conditions that feel challenging during learning produce stronger long-term retention. DCRP keeps difficulty optimal by adjusting to your progress.
Contextual Encoding (multiple studies): Words studied in sentence contexts are retained at higher rates than words studied in isolation. The surrounding sentence provides retrieval cues that strengthen the memory trace.
Frequently Asked Questions
What is a cloze deletion flashcard?
A cloze deletion flashcard is a fill-in-the-blank card where a key word or phrase is hidden inside a complete sentence. You must recall the missing information from the surrounding context. This forces active production rather than passive recognition, making the retrieval process stronger. Cloze cards are particularly effective for vocabulary, definitions, dates, and factual recall.
Are cloze deletions better than regular flashcards?
Cloze deletions are better for single-fact recall because they preserve context and force production. Standard question-answer cards are better for conceptual understanding requiring longer explanations. The ideal study system uses both types: cloze cards for terms, dates, and definitions, and Q&A cards for processes, explanations, and analysis.
What is Diminishing-Cues Retrieval Practice?
Diminishing-Cues Retrieval Practice (DCRP) is a scaffolded testing technique where letter hints are progressively removed as learning improves. Fiechter and Benjamin (2017) showed DCRP enhanced memory even when standard retrieval practice failed. It works by keeping difficulty in the optimal zone: hard enough to strengthen memory, easy enough to avoid repeated failure.
How many words should I blank in a cloze card?
Blank one key term per card (typically 1-3 words). Blanking more than one concept per sentence dilutes focus and turns the card into a guessing exercise. If a sentence contains multiple facts worth testing, create separate cloze cards for each. Keep the surrounding context to one or two sentences maximum.
Does any app offer DCRP on cloze cards?
Notesmakr is currently the only flashcard app that implements Diminishing-Cues Retrieval Practice on cloze deletion cards. The feature is free (no subscription required) and includes syllable-aware hints, contextual clues, and progressive difficulty that adapts to your learning progress. Anki supports basic cloze deletions but without progressive hints.
Start Using Cloze Deletions Today
- Pick three facts from your current study material
- Rewrite each as a single sentence in your own words
- Blank the key term in each sentence
- Download Notesmakr and create cloze cards with DCRP progressive hints (free)
- Review daily with spaced repetition and watch the hints disappear as you learn
- Import your Anki decks if you already have cloze cards (free .apkg import)
The difference between a student who remembers and one who forgets is not talent. It is technique. Cloze deletion with progressive hints is the technique most students never discover. Now you have.
"The first principle is that you must not fool yourself, and you are the easiest person to fool."
— Richard Feynman