Primary_English_OS := a closed-loop capability regeneration system
that upgrades a child’s English reliability from P0→P3 across:
  (A) Vocabulary (retrieval),
  (B) Comprehension (meaning under load),
  (C) Composition (output under time),
  (D) Language control (sentence structures + clarity).

Mastery(P3) = child can:
  - understand unseen passages reliably
  - plan + write a coherent composition on time
  - use varied vocabulary naturally (not forced)
  - maintain sentence clarity with low error rate

Primary_English_OS {
  Inputs:
    - stories, conversations, reading exposure
    - teacher/tutor prompts + feedback
  Core Engines:
    - Vocabulary_OS (P0–P3 retrieval)
    - Comprehension_OS (meaning extraction)
    - Composition_OS (planning + narrative output)
    - Structure_OS (sentence patterns + connectors)
  Sensors:
    - recall time, variation index, freeze events
    - comprehension accuracy, inference stability
    - grammar error rate, coherence score
  Repair Loops:
    - micro drills + rewrite + spaced recall
    - timed writing + weakest paragraph rewrite
  Outputs:
    - PSLE-ready reliability under time pressure
}

Input != Output.
Reading improves recognition (P1).
Writing under time pressure requires P3 retrieval + structure automation.

P0: cannot read/express meaning reliably
P1: can recognise words, understands when guided
P2: can perform in practice, unstable in tests
P3: stable performance in unseen + timed conditions

Goal: move words/chunks from P1→P3 (load-stable retrieval)
Pass(P3) if:
  RecallTime < 2s for targeted words
  + correct usage frame (collocation/tone)
  + survives timed writing

Goal: extract meaning from unseen text under time pressure
Pass(P3) if:
  - accurate factual retrieval
  - stable inference (not guessing)
  - can explain answers with evidence from text

Goal: produce coherent story with vivid language on time
Pass(P3) if:
  - finishes on time
  - 5-box plan coherence holds
  - vocabulary variation visible
  - weakest paragraph not collapsing repeatedly

Goal: grammar and clarity become automatic (not “remember rules”)
Pass(P3) if:
  - low error rate per 120 words
  - connector diversity present
  - sentence clarity test passes (who did what)

FM1: Passive vocabulary trap (P1) — “knows when sees”
FM2: Guessing comprehension — no evidence-based answering
FM3: Flat language — generic verbs + repeated adjectives
FM4: Planning absent — writes without structure → coherence breaks
FM5: Sentence control weak — tense drift / run-ons / fragments
FM6: Exam collapse — timer triggers freeze, output drops to basic words

V_Sensors {
  RecallTime(word) < 2s
  GenericVerbRate trending down
  VariationIndex trending up
  CollocationErrorRate low
  FreezeEvents during timed writing → must be near zero
}

C_Sensors {
  UnseenAccuracy (literal) >= target band
  InferenceStability (same answer after re-read)
  EvidenceQuoteHabit (can point to text)
  WrongAnswerType tags: misread / over-infer / vocab gap
}

W_Sensors {
  TimeToStartWriting < 2 min (no freeze)
  ParagraphCoherence stable
  WeakestParagraphIndex improves weekly
  UpgradesUsedCorrectly >= 8–12 per comp
}

S_Sensors {
  ErrorPer100Words <= threshold band
  ConnectorDiversity >= 4 types per comp
  SentenceClarityPass (reader knows actor/action)
}

Loop_Vocab_P3 {
  pick 5 words/week
  for each word:
    - 2-sentence anchor (neutral + emotional)
    - collocation pair bank (3 pairs)
    - speak-then-write transfer
    - spaced recall: T+0, +10m, +24h, +7d
}

Loop_Comprehension {
  do 1 short unseen passage
  tag each wrong answer by cause:
    - vocab gap
    - misread
    - inference leap
  repair:
    - re-read evidence
    - rewrite answer in own words
}

Loop_Timed_Paragraph {
  8–12 minutes
  constraints:
    - inject 6 upgrades (words/chunks)
    - use 4 connector types
  after:
    - rewrite weakest paragraph (once)
}

Loop_Full_Comp {
  5-box plan (2–4 minutes)
  write full comp (time-bound)
  checklist:
    - clarity
    - variation
    - strongest verb upgrades
  repair:
    - rewrite weakest paragraph
}

Target:
  - grow word meaning + usage frames
  - reduce passive trap
Daily:
  - story input 10 min
  - 2-sentence anchors (1–2 words/day)
Weekly:
  - 1 short comp paragraph + rewrite

Target:
  - 5-box planning becomes automatic
  - 1 structure per week
2–3×/week:
  - timed paragraph + upgrade injection
Weekly:
  - full comp mini-sim

Target:
  - stability under timer
  - freeze events → near zero
2–3×/week:
  - timed comp segments
  - weakest paragraph rewrite

Target:
  - unseen + full Paper 1 stability
Monthly/Weekly:
  - Paper 1 simulation
  - error log + router repairs

More worksheets → more exposure (P1)
→ no forced output + no load training
→ writing stays basic
→ exams trigger freeze
→ marks stagnate despite “hard work”

Replace “more practice” with:
  vocabulary P3 drills + timed output + rewrite loops

If your child knows words but can’t use them in composition,
they are stuck in Passive Vocabulary (P1).
Use Vocabulary OS loops to convert P1→P3 under exam load.

Composition mastery is a closed-loop system:
diagnose leaks → train structure → train load → transfer to exam.
Use the 12–16 week repair protocol to make writing reliable.

Secondary English OS upgrades the same engines,
but under higher load: argumentation, inference density,
and stricter exam timing.