Definition:
Input flood is a deliberate teaching technique that increases the density of a target grammatical or lexical form in input materials. By flooding texts or listening passages with repeated examples of the target structure, learners are more likely to notice it and process it for intake.
In-Depth Explanation
Input flood is typically used in the context of Form-Focused Instruction and Processing Instruction. It does not require learners to produce the target form; instead, it makes the form more salient in comprehension.
For example, a classroom focusing on the English past tense might read multiple short stories containing many past-tense verbs, or a Japanese lesson on the te-form might present numerous sentences where that form appears. The goal is to increase exposure in a way that supports noticing and intake.
History
- 1990s: The concept of input flood emerges from research on input enhancement and the role of noticing in SLA.
- 1997: Merrill Swain and other researchers begin contrasting input-focused and output-focused approaches, situating input flood as a tool for increasing the likelihood of noticing in input.
- 2000s: Empirical studies examine input flood in foreign language classrooms, generally finding that repeated exposure improves recognition and comprehension of the target form.
Common Misconceptions
“Input flood is the same as input enhancement.” Input flood and input enhancement are distinct techniques with different mechanisms: input flood increases the frequency of target form occurrence in texts without highlighting or typographical modification; input enhancement makes target forms visually or auditorally salient without necessarily increasing their frequency. The two techniques can be combined (flooded and enhanced input), but each targets a different aspect of the acquisition process — frequency exposure (flood) vs. noticeability (enhancement).
“Input flood guarantees noticing of the target form.” The relationship between exposure frequency and noticing is probabilistic: high frequency increases the likelihood of the learner noticing the form but does not ensure it. If a target form is not required for comprehension (functionally transparent), learners may semantically process texts without attending syntactically to the repeated target structure, limiting the acquisition value of flood conditions even when exposure frequency is high.
Criticisms
Input flood research has produced inconsistent results in terms of productive acquisition gains: learners exposed to flooded input show improved recognition and comprehension of target forms, but these gains often do not extend to spontaneous productive use without additional output-focused instruction. The specificity of input flood for low-frequency target forms (forms the learner lacks in their interlanguage) is not adequately addressed — flood conditions are easier to design for forms learners have already partially acquired than for forms that are entirely new. Input flood is also criticized for the practical challenge of producing high-quality authentic-feeling texts with unnatural repetition of target forms.
Social Media Sentiment
Input flood, as a formal pedagogical concept, is primarily used in teaching methodology discussions rather than in general learner communities. The underlying principle — encountering a form frequently through extensive exposure builds familiarity and eventual acquisition — is widely understood and practiced through immersion methodology: watching shows in the L2 repeatedly, reading multiple texts by the same author, or using genre-specific reading materials where domain vocabulary recurs frequently. The input flood concept captures the mechanism behind the community advice that “the more input you get, the more vocabulary sticks.”
Last updated: 2026-04
Practical Application
Examples of input flood implementation:
- Creating reading passages with many instances of the target grammar
- Designing listening scripts that repeat a new sentence structure
- Using glossed vocabulary where the same form appears in different contexts
Input flood is often combined with pre-task priming and follow-up comprehension checks to make the form easier to notice.
Related Terms
See Also
Research
- Schmidt, R., & Frota, S. (1986). Developing basic conversational ability in a second language: A case study of an adult learner of Portuguese. In R. Day (Ed.), Talking to Learn: Conversation in Second Language Acquisition. Newbury House. [Summary: Early evidence that enhanced input and conscious attention to forms can support SLA.]
- Ellis, R. (1994). The study of second language acquisition. Oxford University Press. [Summary: Describes input flood as a technique for promoting form noticing in input-rich contexts.]
- Gass, S. M. (1997). Input, Interaction, and the Second Language Learner. Lawrence Erlbaum. [Summary: Reviews how increased frequency and salience in input affect intake and acquisition.]