The Input Hypothesis

The Input Hypothesis, proposed by linguist Stephen Krashen, suggests that language learners acquire new language skills best when they are exposed to language that is just slightly beyond their current understanding. This "comprehensible input," often represented as "i+1" (where "i" is the learner's current level), helps learners make sense of unfamiliar language in context. For effective learning, materials should challenge learners without overwhelming them, allowing them to gradually expand their vocabulary and understanding as they engage with new ideas and structures. Ultimately, this approach emphasizes the importance of meaningful exposure to language.