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PSLE OS (V1.1) — Outcome Reliability Under Time Pressure

Definition Lock (V1.1)

PSLE OS is the reliability system that converts Primary 1–6 learning into stable outcomes across papers under time pressure, by controlling variance, transfer, stamina, and error closure.

What mastery actually is (P3)

A PSLE-ready student is P3 when they can:

  • maintain accuracy under exam timing,
  • handle unfamiliar question skins (transfer),
  • recover after mistakes (no cascade),
  • produce stable results across multiple full papers (low variance).

Top 6 failure modes

  1. Variance explosion (wild swings across papers despite “studying hard”)
  2. Time pressure collapse (accuracy and structure drop when timed)
  3. Transfer failure (new skin breaks previously “mastered” topics)
  4. Mixed-topic integration failure (can do chapters, fails full papers)
  5. Stamina curve drop (performance falls in later sections)
  6. Error non-closure (repeated mistakes survive until the exam)

Sensor Pack (PSLE OS)

  • Variance Index (VI): paper-to-paper swing
  • Time Pressure Collapse (TPC): timed vs untimed drop
  • Transfer Score (TS): 3-variant tests
  • Mixed Set Integrity (MSI): stability on mixed-topic sections
  • Stamina Curve (SC): marks by section/time
  • Repeat Error Rate (RER): repeated errors across weeks
  • Recovery After Error (RAE): does one mistake cascade?

Repair Loops (PSLE OS)

Loop 1 — Full-Paper Diagnostics Loop

  • Do paper → map errors to sensors (TS/RER/TPC/MSI) → choose 1–2 repair targets only

Loop 2 — Error Closure + Spaced Retest

  • Every error must close: classify → fix → micro-drill → retest after delay → transfer retest

Loop 3 — Timed Stitching Ramp

  • Stable untimed → lightly timed → exam-timed
  • Increase timing only when TPC stays controlled

Loop 4 — Mixed Integration Loop

  • Mixed-topic sets weekly; train switching without panic
  • Goal: MSI stability

Directory to levels (Primary 1–6)

  • Pri 1–4: build core pipelines (vocab, number sense, concept cores, steps)
  • Pri 5: integration year (mixed sets, transfer building, repair discipline)
  • Pri 6: reliability year (timed stitching, variance control, stamina curve)

Canonical takeaways (V1.1)

  • PSLE is not “harder content” — it is reliability under load.
  • The winning lever is variance control + transfer + timed stitching.
  • Papers without closure loops create brittle students.

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