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The Output Hypothesis

Merrill Swain came to propose the Output Hypothesis based on her observations of French immersion classrooms that very rarely did students say anything longer than a clause, and that many graduates of French immersion programs still had grammatical inaccuracies in their speech that never went away even after many years of immersion education. In contrast with Stephen Krashen’s 1977 Input Hypothesis, Swain’s Output Hypothesis posited that comprehensible input on its own is not enough for language learning.

The Output Hypothesis proposes that “through producing language, either spoken or written, language acquisition/learning may occur”, because learners are more likely to notice gaps in their knowledge when producing output, and learn as a result of trying to fill that gap.

The Output Hypothesis attributes three main functions to the production of language (output) that are relevant to language learning:

  1. The noticing/triggering function - in attempting to produce language, learners may become aware of a gap between their intended meaning and the form closest to that meaning that they can produce using their current knowledge.
  2. The hypothesis-testing function - output can be a reflection of hypotheses about the language that learners are testing.
  3. The metalinguistic (reflective) function - “using language to reflect on language produced by others or the self mediates second language learning”.

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