I'm not sure who first coined the terms fine-tuning and rough-tuning of input, but they have certainly become associated with the work of Stephen Krashen. In this post, I'll explain what the terms refer to and what they might mean for language teacher practice. We all know that a prequisite for first and additional language acquisition is input students can understand ( comprehensible input , to use Krashen's familar term). Krashen used the formula i + 1 to describe input which is at or just above the learner's current level. This would imply giving students aural and written texts, dialogues, etc, which contain a large majority of vocabulary students already know (Paul Nation and others write about 95-98% knowledge), using grammatical constructions which students are already familiar with. This is where the distinction between fine-tuning and rough-tuning of input comes in. There is no precise definition of this, but essentially if you finely tune the input you go out...
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