apply-comprehensible-input-strategy

name	apply-comprehensible-input-strategy
description	Use when a learner wants to accelerate acquisition through structured exposure to target-language content just above their current level
source	Stephen Krashen "The Input Hypothesis" (1985); Mason & Krashen "Extensive Reading in English as a Foreign Language" (1997); Free Voluntary Reading research
tags	["comprehensible-input","reading","listening","acquisition"]
verified	true

Apply Comprehensible Input Strategy

Select, sequence, and consume target-language content pitched at i+1 (one step above current level) so acquisition occurs naturally through meaning-focused exposure.

Why This Is Best Practice

Adopted by: ACTFL extensive reading programs, University of Southern California language acquisition research, Japanese language schools using TPRS (Teaching Proficiency through Reading and Storytelling) Impact: Mason & Krashen (1997) found extensive reading groups outperformed grammar instruction groups on all measures; Krashen's FVR studies show 30 minutes daily free reading yields vocabulary gains equivalent to explicit instruction with 3x the study time Why best: Acquisition is subconscious and occurs through meaning-focused exposure — explicit study transfers to monitor use only; i+1 input triggers hypothesis formation and pattern internalization without metalinguistic overhead

Sources: Krashen (1985) input hypothesis and i+1 concept; Mason & Krashen (1997) extensive reading evidence; TPRS research base

Steps

1. Determine current level precisely — read or listen to three candidate texts; select the level where you understand 70–80% without a dictionary.
2. Apply the i+1 filter — choose content where new vocabulary or structures constitute no more than 20% of each passage; beyond that, input is incomprehensible.
3. Build a graded content ladder — sequence materials from current level to target level in steps: graded readers (A2 → B1 → B2), then authentic texts with glosses, then unmodified native content.
4. Prioritize volume over precision — read and listen for quantity; 30+ minutes daily of comprehensible input outweighs 10 minutes of intensive analysis.
5. Use context before dictionary — attempt to infer unknown words from surrounding context; only look up words that block comprehension after two failures.
6. Log encounters, not lookups — mark words seen in context without looking up; after 3–5 encounters, add to SRS deck if still unknown.
7. Select intrinsically interesting content — motivation drives continuation; a compelling story sustains 60-minute reading sessions that textbook exercises cannot.
8. Use narrow reading/listening — consume multiple texts on the same topic or by the same author; repeated vocabulary and syntax patterns consolidate faster.
9. Do not force output during input sessions — comprehensible input sessions are acquisition-mode, not performance-mode; note-taking is acceptable, speaking is not required.
10. Track comprehension percentage weekly — if comprehension on new material improves, step up to harder content; plateau signals need to expand content variety.

Rules

• 70–80% comprehension is the acquisition sweet spot — above 95% is too easy; below 60% is noise.
• Never use bilingual texts as the primary input — parallel translation prevents the brain from building direct target-language meaning associations.
• Extensive reading requires volume — fewer than 10,000 words per week yields measurable but slow gains; 50,000+ words per week produces rapid vocabulary growth.
• Input quality matters: native-speaker content at appropriate level beats simplified learner materials at higher level.

Common Mistakes

• Using a dictionary every other sentence — constant interruption breaks the meaning-focus state; defer lookup until comprehension collapses.
• Choosing content that is too advanced to impress — reading literary C2 texts at B1 produces frustration, not acquisition.
• Treating input as a supplement to grammar study — at B1+, comprehensible input should be the primary acquisition engine, not a supplement.
• Confusing quantity with quality — passive background listening to incomprehensible audio is not comprehensible input; attention and comprehension are required.

When NOT to Use

• Learner is at true A0 with no phonological map of the language — structured pronunciation and core phrase instruction must precede input flooding
• Exam requires explicit grammar rule production (e.g., translation exam, formal grammar test) — explicit instruction is more efficient for that specific output type
• Learner has dyslexia or reading disability — audio-primary comprehensible input strategies should substitute for reading-dominant approaches