Table of Contents
1. Stephen Krashen: The Educational Theorist
Stephen Krashen (1941–) is a highly influential linguist and educational theorist whose theories on Second Language Acquisition (SLA) have permanently revolutionized modern language pedagogy. His work fiercely supports communicative and immersion-based approaches, prioritizing natural acquisition environments over rigid grammatical instruction.
2. The Monitor Model (1970s/80s)
Developed in the 1970s and 1980s, Krashen's Monitor Model is one of the most widely cited theories in SLA. The model strictly distinguishes between conscious processing (learning) and subconscious processing (acquisition). It underscores the vital importance of rich input over explicit instruction, radically shifting teaching methodologies to prioritize comprehension over forced production.
3. Krashen's Five Hypotheses of SLA
The Monitor Model comprises five interrelated hypotheses. Mastering these is crucial for the UGC NET exam.
🔥 Match the List: The 5 Hypotheses
| Hypothesis | Core Concept & Implication |
|---|---|
| 1. Acquisition-Learning Hypothesis | Acquisition is a subconscious, intuitive process (how children learn). Learning is a conscious process involving formal rule memorization. True fluency is the result of acquisition, not learning. |
| 2. Monitor Hypothesis | Conscious learning acts only as an internal "Monitor" (editor) to polish acquired language. Over-reliance leads to hesitant, unnatural speech. |
| 3. Natural Order Hypothesis | Grammatical structures are naturally acquired in a predictable, universal order, irrespective of how they are explicitly taught in a classroom. |
| 4. Input Hypothesis (i+1) | Learners acquire language best when exposed to comprehensible input slightly beyond their current proficiency level, referred to mathematically as i + 1. |
| 5. Affective Filter Hypothesis | A metaphorical barrier influenced by emotion (anxiety, motivation). A low filter allows input to be processed; a high filter violently blocks learning. |
4. Other Vital Hypotheses in SLA
Beyond Krashen, several other SLA hypotheses frequently appear in exams.
🔥 Key SLA Hypotheses & Theorists
| Hypothesis & Theorist | Core Concept |
|---|---|
| Critical Period Hypothesis (Eric Lenneberg) | Argues there is a biologically determined window (roughly until puberty) for natural language acquisition. Younger learners achieve higher proficiency. |
| Output Hypothesis (Merrill Swain) | Suggests that language production (speaking/writing) is necessary for learners to notice gaps in their knowledge and refine their grammar. |
| Interaction Hypothesis (Michael Long) | Posits that language is best acquired when learners actively negotiate meaning and receive feedback during real-world conversation. |
5. Frequently Asked Questions
What is the difference between Acquisition and Learning in Krashen's theory?
Acquisition is a subconscious, natural process built on meaningful interaction. Learning is a conscious process involving formal grammar instruction. Krashen argues that fluency stems from acquisition, not learning.
What does 'i + 1' mean in the Input Hypothesis?
The formula 'i + 1' represents comprehensible input. 'i' is the learner's current linguistic competence, and '+ 1' represents language input that is just slightly more advanced, pushing the learner to progress naturally.
What is the Affective Filter Hypothesis?
It is a metaphorical barrier governed by emotions. High anxiety or low motivation creates a "high affective filter" that blocks language learning. A low-stress environment creates a "low affective filter," facilitating acquisition.
What is the Critical Period Hypothesis?
Proposed by Eric Lenneberg, it suggests that there is a biologically determined timeframe (ending around puberty) during which language acquisition occurs most naturally and easily.
