Foundation
Krashen states that language structures are most efficiently acquired when presented through comprehensible input that is just beyond the learners’ current proficiency level, thereby forcing them to reach beyond the linguistic input and use previous knowledge and communicative context to gather the meaning of unfamiliar structures Hence, Krashen’s model provides a theoretical foundation for Content Based Instruction in English language Learning that provides student contextualized language curricula built around meaningful and comprehensible input through which not only language but information is required. Second Language Acquisition research emphasizes the literacy development can be facilitated by providing multiple opportunities for learners to interact in communicative context with authentic, linguistically challenging materials that are relevant to their personal and education goals.