Teaching English to Speakers of Other Languages (TESOL) Practice Test 2026 - Free TESOL Practice Questions and Study Guide

Comprehensible input refers to language input that is just slightly above the learner's current level of proficiency. This concept was popularized by linguist Stephen Krashen, who argued that learners acquire language more effectively when they are exposed to language that is both understandable and slightly challenging. This level of input allows learners to make connections between what they already know and new linguistic structures or vocabulary, facilitating the acquisition process.

By interacting with language that is one step beyond their current understanding, learners are encouraged to stretch their abilities and develop their language skills more dynamically. This approach supports not only vocabulary growth but also enhances overall communicative competence, as learners are motivated to engage with the material due to its relevance to their developing language proficiency.

Language that is either too complex or well below the learner's level would not provide the necessary challenge for effective language acquisition. Similarly, language that has no relation to the learner's experiences would not engage them meaningfully, missing the connection that makes learning language more effective.