Definition:

A cloze deletion is a flashcard format in which part of a sentence or phrase is removed (deleted) and replaced with a blank, and the learner must supply the missing word or phrase from memory. Unlike a simple word-definition flashcard, cloze deletions embed vocabulary in context — the surrounding sentence provides meaning cues and models authentic usage, while the blank forces active retrieval of the target item. Cloze deletions are widely used in spaced repetition systems (SRS) and sentence mining workflows.

In-Depth Explanation

The word “cloze” comes from the psychological concept of closure — the human tendency to complete incomplete patterns. In a cloze deletion, the learner encounters a sentence with a gap and must mentally complete it:

> 昨日、図書館で本を_____ました。(きのう、としょかんで ほんを_____)

> (Yesterday, I _____ a book at the library.)

> Answer: 読み (yomi — read)

The surrounding sentence provides strong contextual support — the learner knows the setting, the agent, the object — but cannot retrieve the target verb without actually knowing its form and reading.

Why Cloze Deletions Work

Context-embedded retrieval:

Retrieving a word in its natural syntactic and semantic context strengthens the form-meaning-usage connection far more than retrieving a word from an isolated prompt. Retrieval Practice (the Testing Effect) is already a powerful encoding mechanism; performing it in context adds additional associative encoding.

Meaningful sentence exposure:

Each review of a cloze card is simultaneously a reading comprehension event. The learner processes a complete, meaningful sentence — encountering vocabulary, grammar, and collocations — rather than just a decontextualized target word. This supports incidental acquisition of surrounding language.

Dual coding and context:

The sentence constructs a mental scene or event — a mini-episode in memory — which provides richer, more redundant memory cues than a bare word pair.

Production bias:

Supplying the missing word requires learner production (even if only mental or whispered), which engages motor and articulatory encoding in ways passive reading does not.

Cloze Deletion vs Basic Flashcards

Cloze deletions essentially embed vocabulary in a miniature text — the flashcard becomes a sentence comprehension task rather than a symbol-definition lookup.

Cloze Deletions in Sentence Mining

Cloze deletions are the dominant output format for sentence mining workflows:

1. Encounter an unknown word in a native-language text, video, or podcast
2. Extract the sentence containing the word
3. Create a cloze deletion card (deleting the target word, keeping the rest for context)
4. Review in Anki or another SRS

This workflow grounds vocabulary acquisition in real, level-appropriate input — the sentence comes from something the learner was actually consuming — rather than from curated wordlists.

Types of Cloze Deletions

Single deletion:

One word deleted per card — the most common format. Unambiguous retrieval target; clear pass/fail assessment.

Multiple-field cloze (multiple cards from one sentence):

In Anki, a single sentence can yield multiple cloze cards — one for each target word. The same sentence is then reviewed multiple times, each time with a different word deleted. This efficiently generates multiple review cards from a single authentic sentence.

Phrase-level cloze:

Deleting a multi-word phrase rather than a single word — useful for collocations, set phrases, or grammar patterns.

Production cloze (L1 context ? L2 production):

The sentence is given in L1 (or partially in L2) and the learner must produce the target L2 word. More challenging and production-focused than standard cloze.

Limitations

• Context dependency: If the word is deleted from a long or complex sentence, the surrounding context may be too difficult for the learner’s current level, making the card frustrating rather than productive
• Single occurrence: A cloze card shows the word in one sentence; productive vocabulary knowledge requires encountering a word across many contexts and usages
• Answer ambiguity: In some sentences, multiple words could fill the blank — requiring careful card design so the answer space is constrained

History

• 1953 — Taylor coins “cloze.” Wilson Taylor introduces the cloze procedure in a readability study; words are deleted at regular intervals from a text, which test-takers must restore — the format later adapted for vocabulary learning.
• 1970s–1980s — Cloze in SLA research. Cloze tests are extensively used to measure L2 reading comprehension and proficiency, establishing the format’s validity as a language assessment tool.
• 1990s–2000s — Cloze deletions in flashcard software. Piotr Woźniak’s SuperMemo and later Anki make it easy to create and review cloze deletion flashcards, transforming cloze from an assessment format into a daily study tool.
• 2000s–present — Central to sentence mining. Language learning communities (AJATT, MIA/Refold) adopt sentence mining with cloze deletions as the primary vocabulary acquisition strategy, emphasizing context-embedded learning over abstract wordlists.

Common Misconceptions

“Cloze deletion and cloze testing are the same.” Cloze testing refers to a proficiency or reading assessment procedure where words are deleted at regular intervals from a passage and examinees must fill them in, testing overall language proficiency. Cloze deletion as used in spaced repetition (Anki, Sakubo) is a vocabulary learning card format that deletes a specific target item and tests learner recall in a sentence context — a different purpose and design.

“Any sentence with a word deleted is a cloze deletion card.” Effective cloze deletion requires that the target item be guessable from context clues for recognition while still requiring genuine recall. Poor cloze deletion cards either have too much context (making the answer trivially obvious) or too little (requiring out-of-context guessing). Card design significantly affects learning outcomes.

Criticisms

• Context-dependence: Sentence context makes the retrieval cue richer than in authentic language use, potentially creating context-dependent memory that does not transfer to free production.
• Card quality dependency: Creating effective cloze cards from authentic input is time-intensive; poorly constructed cards can test incidental sentence properties rather than lexical knowledge.

Social Media Sentiment

Cloze deletion is a core topic in Anki-using language learner communities on Reddit (r/Anki, r/LearnJapanese), YouTube, and Discord. Discussions about whether cloze deletion or standard front-back cards produce better vocabulary retention are frequent. Sentence mining with cloze deletion for Japanese (adding lines from immersion content as Anki cards) has a particularly active community advocating for this approach as the most efficient vocabulary learning method. The method is also discussed in medical education communities where Anki is standard.

Last updated: 2026-04

Practical Application

Cloze deletion cards are most effective when created from authentic language encounters — sentences from books, articles, subtitles, or conversations where the learner encountered the target word naturally. Creating a cloze deletion card at the point of encounter ensures sentence memorability and contextual richness. For Japanese vocabulary, cloze deletion cards that include audio of the sentence and furigana for unknown kanji (added via Anki add-ons) maximize the learning dimensions per review.

Related Terms

• Sentence Mining
• SRS (Spaced Repetition System)
• Anki
• Retrieval Practice
• Testing Effect
• Active Recall
• Dual Coding
• Vocabulary Acquisition

See Also

• Sakubo – Study Japanese

Research

• Taylor, W. L. (1953). “Cloze procedure”: A new tool for measuring readability. Journalism Quarterly, 30(4), 415–433.
  Summary: The foundational paper introducing the cloze procedure — originally a readability measure, later adapted for vocabulary and language learning applications.
• Oller, J. W. (1979). Language Tests at School: A Pragmatic Approach. Longman.
  Summary: Comprehensive treatment of cloze testing in L2 contexts; established cloze as a valid and widely-used measure of language proficiency.
• Nation, I. S. P. (2001). Learning Vocabulary in Another Language. Cambridge University Press.
  Summary: Definitive reference on vocabulary acquisition; includes discussion of context-embedding, sentence-level learning, and optimal flashcard formats including cloze deletion.