Cloze Deletion

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

Format	Front	Back	Context
Basic	読む	to read	None
Recognition	to read	読む	None
Cloze	昨日、本を___ました	読み	Full sentence context

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:

Encounter an unknown word in a native-language text, video, or podcast
Extract the sentence containing the word
Create a cloze deletion card (deleting the target word, keeping the rest for context)
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 — Wilson Taylor coins “cloze.”

Wilson Taylor introduced the cloze procedure (from “closure”) in a paper on readability measurement — originally a test of text comprehension where every nth word was deleted. This became a widely used measure of reading proficiency in L1 and L2 research.

1970s–1980s — Cloze tests in SLA research.

Researchers used cloze tests extensively to measure L2 reading comprehension and linguistic proficiency, establishing the format’s validity as a language assessment tool.

1990s–2000s — Cloze deletions in flashcard software.

Piotr Wozniak‘s SuperMemo and later Anki made it easy to create and review cloze deletion flashcards, transforming the cloze format from a test format into an everyday study tool for language learners.

2000s–present — Central to sentence mining communities.

Language learning communities (particularly the Japanese learning community via AJATT, MIA/Refold, and related approaches) adopted sentence mining with cloze deletions as the primary vocabulary acquisition strategy — emphasizing authentic, context-embedded vocabulary 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

Cloze deletion as a study method has been criticized for relying primarily on recognition rather than free recall and production. Seeing the surrounding sentence context makes the retrieval cue substantially richer than encounter in authentic language use, potentially creating context-dependent memory that does not transfer to free production. Additionally, cloze deletion cards require well-designed source sentences — creating high-quality cloze cards from authentic input is time-intensive, and poorly constructed cards can test incidental properties of the sentence 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. Sakubo uses contextual sentence frames in its vocabulary review to achieve the same context-embedding benefits as well-designed cloze deletion cards, without requiring manual card creation.

Related Terms

Research

Taylor, W. L. (1953). “Cloze procedure”: A new tool for measuring readability. Journalism Quarterly, 30(4), 415–433.

The paper that introduced 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.

Comprehensive treatment of cloze testing in L2 contexts — established cloze as a valid and widely-used measure of language proficiency.

Webb, S., Newton, J., & Chang, A. (2013). Incidental learning of collocation. Language Learning, 63(1), 91–120.

Examined context-embedded vocabulary learning — relevant to why cloze-format retrieval in sentence contexts is more robust than isolated word study.

Schmitt, N., Schmitt, D., & Clapham, C. (2001). Developing and exploring the behaviour of two new versions of the Vocabulary Levels Test. Language Testing, 18(1), 55–88.

Vocabulary measurement research — relevant to understanding what different flashcard formats (including cloze) actually test and what knowledge they support.

Nation, I. S. P. (2001). Learning Vocabulary in Another Language. Cambridge University Press.

Definitive reference on vocabulary acquisition — includes discussion of context-embedding, sentence-level learning, and optimal flashcard formats.