This article examines the Noticing Hypothesis – the claim that second language learners must consciously notice the grammatical form of their input in order to acquire grammar. I argue, first, that the foundations of the hypothesis in cognitive psychology are weak; research in this area does not support it, or even provide a clear interpretation for it. The problem of interpreting the hypothesis is much more acute in the area of language acquisition. Partly because the hypothesis is not based on any coherent theory of language, it is very difficult to determine exactly what it means in this context,or to draw testable predictions from it.In the absence of specific predictions, research on form-focused instruction and feedback provide indirect tests, the results of which create additional problems for the hypothesis. The various problems can be eliminated or greatly reduced if the Noticing Hypothesis is reformulated as a claim that noticing is necessary for the acquisition of metalinguistic knowledge but not competence.
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