Comprehensible Input Theory

Comprehensible Input Theory, developed by linguist Stephen Krashen, suggests that people learn languages best when they are exposed to language that is slightly above their current understanding (often referred to as "i+1"). This means that learners should receive information that is understandable but also challenging enough to promote growth. The idea is that when we hear or read things that we can mostly grasp, combined with a bit of new vocabulary or grammar, our understanding improves naturally, leading to more effective language acquisition. In a broader sense, this can apply to learning in general—effective learning occurs when material is accessible yet stimulating.